Arquivo da tag: Mediação tecnológica

Red Brain, Blue Brain: Republicans and Democrats Process Risk Differently, Research Finds (Science Daily)

Feb. 13, 2013 — A team of political scientists and neuroscientists has shown that liberals and conservatives use different parts of the brain when they make risky decisions, and these regions can be used to predict which political party a person prefers. The new study suggests that while genetics or parental influence may play a significant role, being a Republican or Democrat changes how the brain functions.

Republicans and Democrats differ in the neural mechanisms activated while performing a risk-taking task. Republicans more strongly activate their right amygdala, associated with orienting attention to external cues. Democrats have higher activity in their left posterior insula, associated with perceptions of internal physiological states. This activation also borders the temporal-parietal junction, and therefore may reflect a difference in internal physiological drive as well as the perception of the internal state and drive of others. (Credit: From: Darren Schreiber, Greg Fonzo, Alan N. Simmons, Christopher T. Dawes, Taru Flagan, James H. Fowler, Martin P. Paulus. Red Brain, Blue Brain: Evaluative Processes Differ in Democrats and Republicans. PLoS ONE, 2013; 8 (2): e52970 DOI: 10.1371/journal.pone.0052970)

Dr. Darren Schreiber, a researcher in neuropolitics at the University of Exeter, has been working in collaboration with colleagues at the University of California, San Diego on research that explores the differences in the way the brain functions in American liberals and conservatives. The findings are published Feb. 13 in the journalPLOS ONE.

In a prior experiment, participants had their brain activity measured as they played a simple gambling game. Dr. Schreiber and his UC San Diego collaborators were able to look up the political party registration of the participants in public records. Using this new analysis of 82 people who performed the gambling task, the academics showed that Republicans and Democrats do not differ in the risks they take. However, there were striking differences in the participants’ brain activity during the risk-taking task.

Democrats showed significantly greater activity in the left insula, a region associated with social and self-awareness. Meanwhile Republicans showed significantly greater activity in the right amygdala, a region involved in the body’s fight-or-flight system. These results suggest that liberals and conservatives engage different cognitive processes when they think about risk.

In fact, brain activity in these two regions alone can be used to predict whether a person is a Democrat or Republican with 82.9% accuracy. By comparison, the longstanding traditional model in political science, which uses the party affiliation of a person’s mother and father to predict the child’s affiliation, is only accurate about 69.5% of the time. And another model based on the differences in brain structure distinguishes liberals from conservatives with only 71.6% accuracy.

The model also outperforms models based on differences in genes. Dr. Schreiber said: “Although genetics have been shown to contribute to differences in political ideology and strength of party politics, the portion of variation in political affiliation explained by activity in the amygdala and insula is significantly larger, suggesting that affiliating with a political party and engaging in a partisan environment may alter the brain, above and beyond the effect of heredity.”

These results may pave the way for new research on voter behaviour, yielding better understanding of the differences in how liberals and conservatives think. According to Dr. Schreiber: “The ability to accurately predict party politics using only brain activity while gambling suggests that investigating basic neural differences between voters may provide us with more powerful insights than the traditional tools of political science.”

Journal Reference:

  1. Darren Schreiber, Greg Fonzo, Alan N. Simmons, Christopher T. Dawes, Taru Flagan, James H. Fowler, Martin P. Paulus. Red Brain, Blue Brain: Evaluative Processes Differ in Democrats and RepublicansPLoS ONE, 2013; 8 (2): e52970 DOI:10.1371/journal.pone.0052970

Statistical Physics Offers a New Way to Look at Climate (Science Daily)

Mar. 5, 2013 — Statistical physics offers an approach to studying climate change that could dramatically reduce the time and brute-force computing that current simulation techniques require. The new approach focuses on fundamental forces that drive climate rather than on “following every little swirl” of water or air.

Two views, two approaches to simulation. Computer-generated images of a planet’s “zonal velocity” (the west-to-east component of wind) use direct numerical simulation (the traditional approach, left) and direct statistical simulation. The latter has limits, but its development is at a very early stage. (Credit: Marston lab/Brown University)

Scientists are using ever more complex models running on ever more powerful computers to simulate Earth’s climate. But new research suggests that basic physics could offer a simpler and more meaningful way to model key elements of climate.

The research, published in the journal Physical Review Letters, shows that a technique called direct statistical simulation does a good job of modeling fluid jets, fast-moving flows that form naturally in oceans and in the atmosphere. Brad Marston, professor of physics at Brown University and one of the authors of the paper, says the findings are a key step toward bringing powerful statistical models rooted in basic physics to bear on climate science.

In addition to the Physical Review Letters paper, Marston will report on the work at a meeting of the American Physical Society to be held in Baltimore this later month.

The method of simulation used in climate science now is useful but cumbersome, Marston said. The method, known as direct numerical simulation, amounts to taking a modified weather model and running it through long periods of time. Moment-to-moment weather — rainfall, temperatures, wind speeds at a given moment, and other variables — is averaged over time to arrive at the climate statistics of interest. Because the simulations need to account for every weather event along the way, they are mind-bogglingly complex, take a long time run, and require the world’s most powerful computers.

One practical advantage of the new approach: the ability to model climate conditions from millions of years ago without having to reconstruct the world’s entire weather history.Direct statistical simulation, on the other hand, is a new way of looking at climate. “The approach we’re investigating,” Marston said, “is the idea that one can directly find the statistics without having to do these lengthy time integrations.”

It’s a bit like the approach physicists use to describe the behavior of gases.

“Say you wanted to describe the air in a room,” Marston said. “One way to do it would be to run a giant supercomputer simulation of all the positions of all of the molecules bouncing off of each other. But another way would be to develop statistical mechanics and find that the gas actually obeys simple laws you can write down on a piece of paper: PV=nRT, the gas equation. That’s a much more useful description, and that’s the approach we’re trying to take with the climate.”

Conceptually, the technique focuses attention on fundamental forces driving climate, instead of “following every little swirl,” Marston said. A practical advantage would be the ability to model climate conditions from millions of years ago without having to reconstruct the world’s entire weather history in the process.

The theoretical basis for direct statistical simulation has been around for nearly 50 years. The problem, however, is that the mathematical and computational tools to apply the idea to climate systems aren’t fully developed. That is what Marston and his collaborators have been working on for the last few years, and the results in this new paper show their techniques have good potential.

The paper, which Marston wrote with University of Leeds mathematician Steve Tobias, investigates whether direct statistical simulation is useful in describing the formation and characteristics of fluid jets, narrow bands of fast-moving fluid that move in one direction. Jets form naturally in all kinds of moving fluids, including atmospheres and oceans. On Earth, atmospheric jet streams are major drivers of storm tracks.

For their study, Marston and Tobias simulated the jets that form as a fluid moves on a hypothetical spinning sphere. They modeled the fluid using both the traditional numerical technique and their statistical technique, and then compared the output of the two models. They found that the models generally arrived at similar values for the number of jets that would form and the strength of the airflow, demonstrating that statistical simulation can indeed be used to model jets.

There were limits, however, to what the statistical model could do. The study found that as pace of adding and removing energy to the fluid system increased, the statistical model started to break down. Marston and Tobias are currently working on an expansion of their technique to deal with that problem.

Despite the limitation, Marston is upbeat about the potential for the technique. “We’re very pleased that it works as well as it did here,” he said.

Since completing the study, Marston has integrated the method into a computer program called “GCM” that he has made easily available via Apple’s Mac App Store for other researchers to download. The program allows users to build their own simulations, comparing numerical and statistical models. Marston expects that researchers who are interested in this field will download it and play with the technique on their own, providing new insights along the way. “I’m hoping that citizen-scientists will also explore climate modeling with it as well, and perhaps make a discovery or two,” he said.

There’s much more work to be done on this, Marston stresses, both in solving the energy problem and in scaling the technique to model more realistic climate systems. At this point, the simulations have only been applied to hypothetical atmospheres with one or two layers. Earth’s atmosphere is a bit more complex than that.

“The research is at a very early stage,” Marston said, “but it’s picking up steam.”

Related app:http://www.brown.edu/Research/Environmental_Physics/Environmental_Physics/Code.html

Journal Reference:

  1. S. M. Tobias, J. B. Marston. Direct Statistical Simulation of Out-of-Equilibrium JetsPhysical Review Letters, 2013 DOI: 10.1103/PhysRevLett.110.104502

Não faltam avisos: cuidado com o clima (Envolverde)

Ambiente

18/3/2013 – 11h05

por Washington Novaes*

clima 300x225 Não faltam avisos: cuidado com o clima

Foto: Divulgação/ Internet

É preciso insistir e insistir: as grandes cidades brasileiras – mas não apenas elas – precisam criar com urgência políticas do clima que as habilitem a enfrentar com eficiência os “desastres naturais”, cada vez mais frequentes e intensos e que provocam um número cada vez maior de mortos e outras vítimas; precisam arrancar do fundo das gavetas projetos que permitam evitar inundações em áreas urbanas; criar planos diretores que incorporem as novas informações nessa área; rever os padrões de construção, já obsoletos, concebidos em outras épocas, para condições climáticas muito mais amenas – e que se mostram cada vez mais vulneráveis a desabamentos; incorporar as universidades nessa busca de formatos científicos e tecnológicos.

Segundo este jornal (21/2), de 12 locais alagados em uma semana no mês passado na cidade de São Paulo, 11 já sofriam com inundações há 20 anos – entre eles, alguns dos pontos com mais veículos e pessoas, como o Vale do Anhangabaú, a Avenida 23 de Maio, a Rua Turiaçu. E a Prefeitura de São Paulo promete desengavetar 79 obras antienchentes, algumas delas abafadas há 15 anos. Inacreditável. O governo do Estado assegura que vai trabalhar em 14 piscinões (outros 30 caberão a parcerias público-privadas), além de aplicar mais R$ 317 milhões em desassoreamento do Rio Tietê, onde já foi gasto R$ 1,7 bilhão (terá de gastar muito mais enquanto não decidir atuar nas dezenas de afluentes do rio sob o asfalto, que carregam sedimentos, lixo, esgotos, etc.). A população paulistana ficará muito grata – ela e 1 milhão de pessoas que entram e saem diariamente da cidade (Estado, 27/2).

Enquanto não houver uma ação enérgica na área do clima e na revisão dos padrões de construção em toda parte, continuaremos assim, como nas últimas semanas: obra irregular provoca desabamento de prédio na Liberdade e mata pedestre (1.ª/3); edifício de 20 andares desaba no Rio e arrasta mais dois, com 22 mortos (25/1); desabamento de lajes em construção de 13 pavimentos em São Bernardo do Campo mata duas pessoas (6/2); enchente em fábrica mata quatro em Sorocaba; inundação no Rio mata cinco pessoas (8/3); homem salva três pessoas e morre junto com um estudante, levados pela enxurrada durante temporal de cinco horas no Ipiranga, quando caiu um terço da chuva prevista para o mês e fez transbordar o Tamanduateí (11/3); deslizamento na moderna Rodovia dos Imigrantes mata uma pessoa e interrompe o tráfego (22/2), numa chuva de 183,4 milímetros, algumas vezes mais do que o índice médio de chuvas em um mês na região. Até o Arquivo Nacional, no Rio de Janeiro, perdeu mais de 130 caixas de documentos históricos num temporal no centro da cidade (10/3).

Não pode haver ilusões. O Brasil já está em quinto lugar entre os países que mais têm sofrido com desastres climáticos. O Semiárido, em outubro último, teve o mês mais seco em 83 anos, segundo o Operador Nacional do Sistema Elétrico (Estado, 31/10); 10 milhões de pessoas foram atingidas em mais de 1300 municípios. O Painel Intergovernamental sobre Mudanças Climáticas, órgão da Convenção do Clima, este ano só divulgará parte de seu novo relatório, mas seu secretário-geral, Rajendra Pachauri, já adverte que é preciso “espalhar a preocupação”, de vez que, com o aumento da temperatura, até 2050, entre 2 e 2,4 graus Celsius, o nível dos oceanos se elevará entre 0,4 e 1,4 metro – mas poderá ser mais, com o avanço do degelo no Ártico (Guardian, 28/2).

Não é por acaso, assim, que o sistema escolar público dos Estados Unidos já tenha, este ano, incorporado as questões do clima a seu currículo para os alunos. E que o Conselho da União Europeia tenha aprovado 20% do seu orçamento – ou 960 bilhões – para políticas e ações nessa área. Porque as informações são altamente preocupantes. Como as da Organização das Nações Unidas para a Alimentação e a Agricultura (9/3) de que duplicou, de 1970 para cá, a superfície de terras afetadas pela seca no mundo; ou a de que as emissões de dióxido de carbono CO2 por desmatamento, atividades agrícolas e outros formatos, entre 1990 e 2010, cresceram muito – e o Brasil responde por 25,8 bilhões de toneladas equivalentes de CO2, seguido pela Indonésia (13,1 bilhões de toneladas) e pela Nigéria (3,8 bilhões).

Os problemas com o clima, diz a Universidade de Reading (1.º/3), indicam que será preciso aumentar a produtividade na agricultura em 12% a partir de 2016, para compensar as perdas e as mudanças nos ambientes. A vegetação nas latitudes mais ao norte da América está mudando, começa a assemelhar-se à das áreas mais ao sul, segundo a Nasa (UPI, 12/3), que analisou o período 1982-2011; e lembra que as atividades no campo terão de adaptar-se. Também há alterações muito fortes em outras regiões, como nos Rios Tigre e Eufrates, que em sete anos (2003-2010) perderam 144 quilômetros cúbicos de água, equivalentes ao volume do Mar Morto (O Globo, 14/2).

Em toda parte as informações inquietam. Universidades da Flórida, por exemplo (Huffpost Miami, 12/3), alertam que será preciso transplantar três grandes estações de tratamento de esgotos no sul do Estado para evitar que elas fiquem “confinadas em ilhas” em menos de 50 anos, por causa da elevação do nível do mar. O almirante Samuel J. Locklear III, comandante da frota norte-americana no Pacífico, diz que essa elevação do nível dos oceanos “é a maior ameaça à segurança”. E que China e Índia precisam preparar-se para socorrer e evacuar centenas de milhares ou milhões de pessoas.

Retornando ao início deste artigo: as cidades brasileiras não podem adiar o enfrentamento das mudanças do clima, principalmente quanto a inundações e deslizamentos de terras (o Brasil tem mais de 5 milhões de pessoas em áreas de risco). Segundo a revista New Scientist (20/10/2012), 32 mil pessoas morreram no mundo, entre 2004 e 2010, em eventos dessa natureza (em terremotos, 80 mil). Não faltam avisos.

Washington Novaes é jornalista.

** Publicado originalmente no site O Estado de S. Paulo.

Obama Will Use Nixon-Era Law to Fight Climate Change (Bloomberg)

By Mark Drajem – Mar 15, 2013 12:50 PM GMT-0300

Daniel Acker/Bloomberg. Similar analyses could be made for the oil sands that would be transported in TransCanada Corp.’s Keystone XL pipeline, and leases to drill for oil, gas and coal on federal lands, such as those for Arch Coal Inc. and Peabody Energy Corp.

President Barack Obama is preparing to tell all federal agencies for the first time that they should consider the impact on global warming before approving major projects, from pipelines to highways.

The result could be significant delays for natural gas- export facilities, ports for coal sales to Asia, and even new forest roads, industry lobbyists warn.

“It’s got us very freaked out,” said Ross Eisenberg, vice president of the National Association of Manufacturers, a Washington-based group that represents 11,000 companies such as Exxon Mobil Corp. (XOM) and Southern Co. (SO) The standards, which constitute guidance for agencies and not new regulations, are set to be issued in the coming weeks, according to lawyers briefed by administration officials.

In taking the step, Obama would be fulfilling a vow to act alone in the face of a Republican-run House of Representatives unwilling to pass measures limiting greenhouse gases. He’d expand the scope of a Nixon-era law that was first intended to force agencies to assess the effect of projects on air, water and soil pollution.

“If Congress won’t act soon to protect future generations, I will,” Obama said last month during his State of the Union address. He pledged executive actions “to reduce pollution, prepare our communities for the consequences of climate change, and speed the transition to more sustainable sources of energy.”

Illinois Speech

The president is scheduled to deliver a speech on energy today at the Argonne National Laboratory in Lemont, Illinois. He is pressing Congress to create a $2 billion clean-energy research fund with fees paid by oil and gas producers.

While some U.S. agencies already take climate change into account when assessing projects, the new guidelines would apply across-the-board to all federal reviews. Industry lobbyists say they worry that projects could be tied up in lawsuits or administrative delays.

For example, Ambre Energy Ltd. is seeking a permit from the Army Corps of Engineers to build a coal-export facility at the Port of Morrow in Oregon. Under existing rules, officials weighing approval would consider whether ships in the port would foul the water or generate air pollution locally. The Environmental Protection Agency and activist groups say that review should be broadened to account for the greenhouse gases emitted when exported coal is burned in power plants in Asia.

Keystone Pipeline

Similar analyses could be made for the oil sands that would be transported in TransCanada Corp. (TRP)’s Keystone XL pipeline, and leases to drill for oil, gas and coal on federal lands, such as those for Arch Coal Inc. (ACI) and Peabody Energy Corp. (BTU)

If the new White House guidance is structured correctly, it will require just those kinds of lifecycle reviews, said Bill Snape, senior counsel at the Center for Biological Diversity inWashington. The environmental group has sued to press for this approach, and Snape says lawsuits along this line are certain if the administration approves the Keystone pipeline, which would transport oil from Canada’s tar sands to the U.S. Gulf Coast.

“The real danger is the delays,” said Eisenberg of the manufacturers’ group. “I don’t think the answer is ever going to be ‘no,’ but it can confound things.”

Lawyers and lobbyists are now waiting for the White House’s Council on Environmental Qualityto issue the long bottled-up standards for how agencies should address climate change under the National Environmental Policy Act, signed into law by President Richard Nixon in 1970.

Environmental Impact

NEPA requires federal agencies to consider and publish the environmental impact of their actions before making decisions. Those reviews don’t mandate a specific course of action. They do provide a chance for citizens and environmentalists to weigh in before regulators decide on an action — and to challenge those reviews in court if it’s cleared.

“Each agency currently differs in how their NEPA reviews consider the climate change impacts of projects, as well as how climate change impacts such as extreme weather will affect projects,” Taryn Tuss, a Council on Environmental Quality spokeswoman, said in an e-mail. “CEQ is working to incorporate the public input we received on the draft guidance, and will release updated guidance when it is completed.”

‘Major Shakeup’

The new standards will be “a major shakeup in how agencies conduct NEPA” reviews, said Brendan Cummings, senior counsel for the Center for Biological Diversity in San Francisco.

The White House is looking at requiring consideration of both the increase in greenhouse gases and a project’s vulnerability to flooding, drought or other extreme weather that might result from global warming, according to an initial proposal it issued in 2010. Those full reports would be required for projects with 25,000 metric tons of carbon dioxide equivalent emissions or more per year, the equivalent of burning about 100 rail cars of coal.

The initial draft exempted federal land and resource decisions from the guidance, although CEQ said it was assessing how to handle those cases. Federal lands could be included in the final standards.

The White House guidance itself won’t force any projects to be stopped outright. Instead, it’s likely to prompt lawsuits against federal projects on these grounds, and increase the probability that courts will step in and order extensive reviews as part of the “adequate analysis” required in the law, said George Mannina, an attorney at Nossaman LLP in Washington.

Next Administration

“The question is: Where does this analysis take us?” he said. “Adequate analysis may be much broader than the agency and applicant might consider.”

While the Obama administration’s guidance could be easily rescinded by the next administration, the court rulings that stem from these cases will live on as precedents, Mannina said.

Lobbying groups such as the U.S. Chamber of Commerce, American Petroleum Institute and the National Mining Association weighed in with the White House against including climate in NEPA, a law initially aimed at chemical leaks or air pollution.

“Not only will this result in additional delay of the NEPA process, but will result in speculative and inaccurate modeling that will have direct impacts on approval of specific projects,” the National Mining Association in Washington wrote in comments to the White House in 2010.

Leases Challenged

The group represents Arch Coal (ACI) and Peabody, both based in St. Louis. Leases that theDepartment of Interior issued for those companies to mine for coal in Wyoming are facing lawsuits from environmental groups, arguing that the agency didn’t adequately tally up the effect on global warming from burning that coal.

Given Obama’s pledge to address global warming, “this is a massive contradiction,” said Jeremy Nichols, director of climate at WildEarth Guardians in Denver, which filed lawsuits against the leases.

Arch Coal referred questions to the mining group.

Beth Sutton, a Peabody spokeswoman, said in an e-mail, “We believe the current regulatory approach to surface mine permits is appropriate and protects the environment.”

Since CEQ first announced its proposal, more than three dozen federal approvals were challenged on climate grounds, including a highway project in North Carolina, a methane-venting plan for a coal mine in Colorado, and a research facility in California, according to a chart compiled by the Center for Climate Change Law at Columbia University.

Next Target

The next target is TransCanada (TRP)’s application to build the 1,661-mile (2,673-kilometer) Keystone pipeline. The Sierra Club and 350.org drew 35,000 people to Washington last month to urge Obama to reject the pipeline. Meanwhile, the NEPA review by the State Department included an initial analysis of carbon released when the tar sands are refined into gasoline and used in vehicles.

It stopped short, however, of saying the project would result in an increase in greenhouse gas emissions. With or without the pipeline, the oil sands will be mined and used as fuel, the report said. That finding is likely to be disputed in court if the Obama administration clears the project.

“Keystone is ground zero,” said Snape, of the Center for Biological Diversity. “Clearly this will come into play, and it will be litigated.”

Any actions by the administration now on global warming would pick up on a mixed record over the past four years.

Cap-and-Trade

While Obama failed to get Congress to pass cap-and-trade legislation, the EPA reversed course from the previous administration and ruled that carbon-dioxide emissions endanger public health, opening the way for the agency to regulate it.

Using that finding, the agency raised mileage standards for automobiles and proposed rules for new power plants that would essentially outlaw the construction of new coal-fired power plants that don’t have expensive carbon-capture technology.

Environmentalists such as the Natural Resources Defense Council say the most important action next will be the EPA’s rules for existing power plants, the single biggest source of carbon-dioxide emissions. The NEPA standards are separate from those rules, and will affect how the federal government itself is furthering global warming.

“Agencies do a pretty poor job of looking at climate change impacts,” Rebecca Judd, a legislative counsel at the environmental legal group Earthjustice in Washington. “A thorough guidance would help alleviate that.”

Social Warfare (Foreign Policy)

Budget hawks’ plans to cut funding for political and social science aren’t just short-sighted and simple-minded — they’ll actually hurt national security.

BY SCOTT ATRAN | MARCH 15, 2013

With the automatic sequestration cuts geared up to slash billions of dollars from domestic programs, military funding, social services, and government-sponsored scientific research — including about a 6 percent reduction for the National Institutes of Health (NIH) and the National Science Foundation (NSF) — policymakers and professionals are scrambling to stave off the worst by resetting priorities. In a major speech last month, House majority leader Eric Cantor (R-VA), proposed outright to defund political and social science: “Funds currently spent by the government on social science — including on politics of all things — would be better spent on curing diseases,” he said, echoing a similar proposal he made in 2009. Florida Governor Rick Scott has made a similar push, proposing to divert state funds from disciplines like anthropology and psychology “to degrees where people can get jobs,” especially in technology and medicine. Those are fighting words, but they’re also simple-minded.

Social science may sound like a frivolous expenditure to legislative budget hawks, but far from trimming fat, defunding these programs would fundamentally undercut core national interests. Like it or not, social science research informs everything from national security to technology development to healthcare and economic management. For example, we can’t decide which drugs to take, unless their risks and benefits are properly assessed, and we can’t know how much faith to have in a given science or engineering project, unless we know how much to trust expert judgment. Likewise, we can’t fully prepare to stop our adversaries, unless we understand the limits of our own ability to see why others see the world differently. Despite hundreds of billions of taxpayer dollars poured into the global war on terrorism, radicalization against our country’s core interests continues to spread — and social science offers better ways than war to turn the tide.

In support of Rep. Cantor’s push to defund political and social science, a recent article in theAtlantic notes that “money [that] could have gone to towards life-saving cancer research” instead went to NSF-sponsored projects that “lack real-world impact” such as “the $750,000 spent studying the ‘sacred values‘ involved in cultural conflict.” Perhaps the use of words like “sacred” or “culture” incites such scorn, but as often occurs in many denunciations of social science, scant attention is actually paid to what the science proposes or produces. In fact, the results of this particular project — which I direct — have figured into numerous briefings to the National Security Staff at the White HouseSenate and House committees, the Department of State and Britain’s Parliament, and the Israeli Knesset (including the prime minister and defense minister). In addition, the research offices of the Department of Defense have also supported my team’s work, which figures prominently in recent strategy assessments that focus on al Qaeda and broader problems of radicalization and political violence.

Let me try to explain just exactly what it is that we do. My research team conducts laboratory experiments, including brain imaging studies — supported by field work with political leaders, revolutionaries, terrorists, and others — that show sacred values to be core determinants of personal and social identity (“who I am” and “who we are”). Humans process these identities as moral rules, duties, and obligations that defy the utilitarian and instrumental calculations ofrealpolitik or the marketplace. Simply put, people defending a sacred value will not trade its incarnation (Israel’s settlements, Iran’s nuclear fuel rods, America’s guns) for any number of iPads, or even for peace.

The sacred values of “devoted actors,” it turns out, generate actions independent of calculated risks, costs, and consequences — a direct contradiction of prevailing “rational actor” models of politics and economics, which focus on material interests. Devoted actors, in contrast, act because they sincerely and deeply believe “it’s the right thing to do,” regardless of risks or rewards. Practically, this means that such actors often harness deep and abiding social and political commitments to confront much stronger foes. Think of the American revolutionaries, who were willing to sacrifice “our lives, our fortunes and our sacred honor” in the fight for liberty against the greatest military power of the age — or modern suicide bombers willing to sacrifice everything for their cause.

Sacred values — as when land becomes “Holy Land” — sustain the commitment of revolutionaries and some terrorist groups to resist, and often overcome, more numerous and better-equipped militaries and police that function with measured rewards like better pay or promotion. Our research with political leaders and general populations also shows that sacred values — not political games or economics — underscore intractable conflicts like those between the Israelis and the Palestinians that defy the rational give-and-take of business-like negotiation. Field experiments in Israel, Palestine, Nigeria, and the United States indicate that commitment to such values can motivate and sustain wars beyond reasonable costs and casualties.

So what are the practical implications of these findings? Perhaps most importantly, our research explains why efforts to broker peace that rely on money or other material incentives are doomed when core values clash. In our studies with colleagues in Afghanistan, India, Indonesia, Iran, the Levant, and North Africa, we found that offers of material incentives to compromise on sacred values often backfire, actually increasing anger and violence toward a deal. For example, a 2010 study of attitudes toward Iran’s nuclear program found that most Iranians do not view the country’s nuclear program as sacred. But for about 13 percent of the population, the program has been made sacred through religious rhetoric. This group, which tends to be close to the regime, now believes a nuclear program is bound up with the national identity and with Islam itself. As a result, offering these people material rewards or punishments to abandon the program only increases their anger and support for it. Predictably, new sanctions, or heightened perception of sanctions, generate even more belligerent statements and actions by the regime to increase the pace, industrial capacity, and level of uranium enrichment. Of course, majority discontent with sanctions may yet force the regime to change course, or to double down on repression.

Understanding how this process plays out over time is a key to helping friends, thwarting enemies, and managing conflict. The ultimate goal of such research is to help save lives, resources, and national treasure. And by generating psychological knowledge about how culturally diverse individuals and groups advance values and interests that are potentially compatible or fundamentally antagonistic to our own, it can help keep the nation’s citizens, soldiers, and potential allies out of harm’s way. Our related research on the spiritual and material aspects of environmental disputes between Native American and majority-culture populations in North America andCentral America has also revealed surprising but practical ways to reduce conflict andsustainably manage forest commons and wildlife.

The would-be defunders of social science denounce an ivory tower that seems to exist only in their imagination — willfully ignoring evidence-based reasoning and results in order to advance a political agenda. Only $11 million of the NSF’s $7 billion-plus budget goes to political science research. It is exceedingly doubtful that getting rid of the entire NSF political science budget, which is equal to 0.5 percent of the cost of a single B-2 bomber, would really help to produce life-saving cancer research, where testing for even a single drug can cost more to develop than a B-2. Not that we must choose between either, mind you.

Social science is in fact moving the “hard” sciences forward. Consider the irony: a close collaborator on the “sacred values” project, Robert Axelrod, former president of the American Political Science Association, recently produced a potentially groundbreaking cancer study based on social science modeling of cancer cells as cooperative agents in competition with communities of healthy cells. Independent work by cancer researchers in the United States and abroad hasestablished that the cooperation among tumor cells that Axelrod and colleagues proposed does in fact take place in cell lines derived from human cancers, which has significant implications for the development of effective treatments.

Research from other fields of social science, including social and cognitive psychology and anthropology, continue to have deep implications for an enormous range of human problems: including how to better design and navigate transportation and communication networks, or manage airline crews and cockpits; on programming robots for industry and defense; on modeling computer systems and cybersecurity; on reconfiguring emergency medical care and diagnoses; in building effective responses to economic uncertainty; and enhancing industrial competitiveness and innovation. For example, perhaps the greatest long-term menace to the security of U.S. industry and defense is cyberwarfare, where the most insidious and hard-to-manage threat may stem not from hardware or software vulnerabilities but from “wetware,” the inclinations and biases of socially interacting human brains — as in just doing a friend a favor (like “click this link” or “can I borrow your flash drive?”). In recognition of that fact, Axelrod has suggested to the White House and Defense Department an “honor code” encouraging individuals to not only maintain cybersecurity themselves, but also not to lapse into doing favors for friends and to report such lapses in others.

Elected officials have the mandate to set priorities for research funding in the national interest. Ever since Abraham Lincoln established the National Academy of Sciences, however, a clear priority has been to allow scientific inquiry fairly free rein — to doubt, challenge, and ultimately change received wisdom if based on solid logic and evidence. What Rep. Cantor and like-minded colleagues seem to be saying is that this is fine, but only in the fields they consider expedient: in technology, medicine, and business. (Though possibly they mean to make an exception for the lucrative social science of polling, which can help to sell almost anything — even terrible ideas like defunding the rest of social science.)

It’s stunning to think that these influential politicians and the people who support them don’t want evidence-based reasoning and research to inform decisions concerning the nature and needs of our society — despite the fact that the vast majority of federal and state legislation deals with social issues, rather than technology or defense. To be sure, there is significant waste and wrongheadedness in the social sciences, as there is in any science (in fact, in any evolutionary process that progresses by trial and error), including, most recently, billions spent on possibly misleading use of mice in cancer research.

But those who would defund social science seriously underestimate the relationship between the wide-ranging freedom of scientific research and its pointed impact, and between theory and practice: Where disciplined imagination sweeps broadly to discover, say, that devoted actors do not respond to material incentives or disincentives (e.g., sanctions) in the same way that rational actors do, or that communities of people and body cells may share deep underlying organizational principles and responses to threats from outside aggressors, such knowledge can have a profound influence on our lives and wellbeing.

Even before they revolted in 1776, the American colonists may have already enjoyed the world’s highest standard of living. But they wanted something different: a free and progressive society, which money couldn’t buy. “Money has never made man happy, nor will it,” gibed Ben Franklin, but “if a man empties his purse into his head no one can take it away from him; an investment in knowledge always pays the best interest.” He founded America’s first learned society “to improve the common stock of knowledge,” which called for inquiry into many practical matters as well as “all philosophical Experiments that Light into the Nature of Things … and multiply the Conveniences or Pleasures of Life.” George Washington, Thomas Jefferson, John Adams, Alexander Hamilton, Thomas Paine, James Madison, and John Marshall all joined Franklin’s society and took part in the political, social, and economic revolution it helped spawn. Like the Founding Fathers, we want our descendants to be able to envision great futures for our country and a better world for all. For that, our children need the broad understanding of how the world works that the social sciences can provide — not just a technical education for well-paying jobs.

New research discovers the emergence of Twitter ‘tribes’ (University of London)

Public release date: 14-Mar-2013

Tanya Gubbay – University of London 

A project led by scientists from Royal Holloway University in collaboration with Princeton University, has found evidence of how people form into tribe-like communities on social network sites such as Twitter.

In a paper published in EPJ Data Science, they found that these communities have a common character, occupation or interest and have developed their own distinctive languages.

“This means that by looking at the language someone uses, it is possible to predict which community he or she is likely to belong to, with up to 80% accuracy,” said Dr John Bryden from the School of Biological Sciences at Royal Holloway. “We searched for unusual words that are used a lot by one community, but relatively infrequently by the others. For example, one community often mentioned Justin Bieber, while another talked about President Obama.”

Professor Vincent Jansen from Royal Holloway added: “Interestingly, just as people have varying regional accents, we also found that communities would misspell words in different ways. The Justin Bieber fans have a habit of ending words in ‘ee’, as in ‘pleasee’, while school teachers tend to use long words.”

The team produced a map of the communities showing how they have vocations, politics, ethnicities and hobbies in common. In order to do this, they focused on the sending of publically available messages via Twitter, which meant that they could record conversations between two or many participants.

To group these users into communities, they turned to cutting-edge algorithms from physics and network science. The algorithms worked by looking for individuals that tend to send messages to other members of the same community.

Dr Bryden then suggested analysing the language use of these discovered communities.

Dr Sebastian Funk from Princeton University said: “When we started to apply John’s ideas, surprising groups started to emerge that we weren’t expecting. One ‘anipals’ group was interested in hosting parties to raise funds for animal welfare, while another was a fascinating growing community interested in the concept of gratitude.”

Pobre previsão do tempo (Folha de S.Paulo)

15/03/2013 – 03h01

Michel Laub

Num artigo publicado na Folha em 2010 (http://goo.gl/fLVDJ), João Moreira Salles discutiu a hipervalorização das humanidades no Brasil, em detrimento de disciplinas como matemática, física e engenharia. Um dos efeitos da distorção, acrescento, é a pouca familiaridade –do público, dos intelectuais, da imprensa– com o discurso técnico e científico. E, por consequência, a docilidade com que são aceitas falácias nessas áreas.

Exemplos: propaganda de governo (números para todos os gostos), dietas da moda (pesquisas com todo tipo de metodologia e patrocínio), tratamentos de saúde (custo-benefício muitas vezes discutível) e até planilhas de futebol (nas quais um volante que só dá passes curtos terá índice de acerto maior que um lançador vertical).

De minha parte, resolvi testar um discurso científico bastante presente no cotidiano: o da meteorologia. Durante 28 dias de janeiro último, anotei erros e acertos do “Jornal do Tempo” (http://jornaldotempo.uol.com.br).

Um trabalho leigo, por certo, e consciente de que o serviço em questão não é representativo do setor no país ou no mundo. A home page do “Jornal do Tempo” apresenta dados que são uma média, um resumo –como na previsão da TV– de registros mais detalhados, inclusive em algumas de suas páginas internas.

Ocorre que médias são a face pública da meteorologia, o tal discurso –em tom seguro e cordial– que nos orienta a escolher a roupa de manhã, a levar ou não o guarda-chuva. E aí, assim como alguma lógica basta para perceber furos em trabalhos estatísticos, não é preciso ser expert para afirmar que há muita imprecisão no ramo.

As temperaturas do meu caderninho quase sempre estiveram dentro dos intervalos previstos na véspera (23 em 28 ocorrências). Comparadas à previsão da semana anterior, o índice cai para 17 em 28. Se botarmos lado a lado o intervalo previsto sete dias antes e o previsto no próprio dia, há diferença em 28 de 28.

Já nas condições atmosféricas, cuja conferência é mais difícil –da minha casa em Pinheiros, não tenho como saber se fui traído por uma garoa enquanto dormia ou algo assim–, houve 15 erros em 28.

São coisas aparentemente sem importância: um ou dois graus a mais, sol durante algumas horas num dia “fechado e chuvoso, com poucas trovoadas”. Mas há reparos objetivos senão aos métodos de medição, ao menos à forma como o resultado é exposto.

Assim, cravar uma temperatura única numa cidade como São Paulo, com seus morros e depressões, paraísos verdes e infernos de concreto em 1,5 milhão de quilômetros quadrados, é inexato por princípio. Igualmente a previsão do tempo numa só frase, que contempla tanto o pé d’água rápido e inofensivo quanto o dilúvio e o caos, dependendo da estrutura do bairro onde se está (“sol, alternando com chuva em forma de pancadas isoladas”).

A questão fica mais complexa quando transcende o território do erro, que é humano e aceitável. E da própria meteorologia, aqui citada apenas como sintoma. A autoridade que emana do discurso científico não se limita a influenciar debates acadêmicos sobre química ou astronomia.

Trata-se, também, de um fenômeno das ciências humanas. Seus desdobramentos políticos, econômicos e morais na sociedade como um todo não são desprezíveis. Foram teorias racialistas que justificaram a escravidão. Foi uma doutrina de incentivo à competição tecnológica que criou as armas nucleares.

No caso do aquecimento global, a grande bandeira científica de hoje, antes de tudo há um imperativo de bom senso: é mais inteligente viver de forma harmônica com a natureza, com menos emissão de carbono, desmatamento e desperdício consumista. Também imagino que previsões de climatologia sejam mais precisas do que, digamos, as da moça que descreve as condições do Sudeste inteiro em dez segundos no “Jornal Nacional”. Mas é fato que a revista “Time” alertou sobre a “nova era glacial” em 1974. E deu uma capa célebre, dez anos depois, sobre a hoje contestada ligação entre infarto e gema de ovo.

Os dois textos reproduziam uma conjectura científica influente à época. É recomendável seguir as que o são hoje –afinal, é o que mais próximo temos de certezas fora do fanatismo religioso ou ideológico. Apenas é bom, como dúvida saudável, em qualquer área de conhecimento vendido como infalível, lembrar da pobre previsão do tempo.

When It Rains These Days, Does It Pour? Has the Weather Become Stormier as the Climate Warms? (Science Daily)

Mar. 17, 2013 — There’s little doubt — among scientists at any rate — that the climate has warmed since people began to release massive amounts greenhouse gases to the atmosphere during the Industrial Revolution.

But ask a scientist if the weather is getting stormier as the climate warms and you’re likely to get a careful response that won’t make for a good quote.

There’s a reason for that.

“Although many people have speculated that the weather will get stormier as the climate warms, nobody has done the quantitative analysis needed to show this is indeed happening,” says Jonathan Katz, PhD, professor of physics at Washington University in St. Louis.

In the March 17 online version ofNature Climate Change, Katz and Thomas Muschinksi, a senior in physics who came to Katz looking for an undergraduate thesis project, describe the results of their analysis of more than 70 years of hourly precipitation data from 13 U.S. sites looking for quantitative evidence of increased storminess.

They found a significant, steady increase in storminess on the Olympic Peninsula in Washington State, which famously suffers from more or less continuous drizzle, a calm climate that lets storm peaks emerge clearly.

“Other sites have always been stormy,” Katz says, “so an increase such as we saw in the Olympic Peninsula data would not have been detectable in their data.”

They may also be getting stormier, he says, but so far they’re doing it under cover.

The difference between wetter and stormier

“We didn’t want to know whether the rainfall had increased or decreased,” Katz says, “but rather whether it was concentrated in violent storm events.”

Studies that look at the largest one-day or few-day precipitation totals recorded in a year, or the number of days in which in which total precipitation is above a threshold, measure whether locations are getting wetter, not whether they’re getting stormier, says Katz.

To get the statistical power to pick up brief downpours rather than total precipitation, Muschinski and Katz needed to find a large, fine-grained dataset.

“So we poked around,” Katz says, “and we found what we were looking for in the National Oceanic and Atmospheric Administration databases.”

NOAA has hourly precipitation data going back to 1940 or even further for many locations in the United States. Muschniski and Katz chose 13 sites that had long runs of data and represented a broad range of climates, from desert to rain forest.

They then tested the hypothesis that storms are becoming more frequent and intense by taking different measurements of the “shape” formed by the data points for each site.

Measuring these “moments” as they’re called, is a statistical test commonly used in science, says Katz, but one that hasn’t been applied to this problem before.

“We found a significant steady increase in stormy activity on the Olympic Peninsula,” Katz says. “We know that is real.”

“We found no evidence for an increase in storminess at the other 12 sites,” he said, “but because their weather is intrinsically stormier, it would be more difficult to detect a trend like that at the Olympic Peninsula even if it were occurring.”

The next step, Katz says, is to look at a much large number of sites that might be regionally averaged to reveal trends too slow to be significant for one site.

“There are larger databases,” he says, “but they’re also harder to sift through. Any one site might have half a million hourly measurements over the period we’re looking at, and to get good results. we have to devise an algorithm tuned to the database to filter out spurious or corrupted data.”

You could call that a rainy-day project.

Journal Reference:

  1. T. Muschinski, J. I. Katz. Trends in hourly rainfall statistics in the United States under a warming climateNature Climate Change, 2013; DOI:10.1038/nclimate1828

How to Predict the Future of Technology (Science Daily)

Jan. 25, 2013 — The bread and butter of investing for Silicon Valley tech companies is stale. Instead, a new method of predicting the evolution of technology could save tech giants millions in research and development or developments of new products — and help analysts and venture capitalists determine which companies are on the right track.

The high-tech industry has long used Moore’s Law as a method to predict the growth of PC memory. Moore’s Law states that the number of chips on a transistor doubles every 18 months (initially every year). A paper by Gareth James and Gerard Tellis, professors at the USC Marshall School of Business and their co-authors Ashish Sood, at Emory and Ji Zhu at the University of Michigan, concludes that Moore’s Law does not apply for most industries, including the PC industry.

High-tech companies traditionally use Moore’s Law and other similar heuristics to predict the path of evolution of competing technologies and to decide where to funnel millions into research and development or new product development. The paper’s researchers claim that these models are outdated and inaccurate.

The paper offers a new model, Step and Wait (SAW), which more accurately tracks the path of technological evolution in six markets that the authors tested. According to the researchers, Moore’s Law and other models such as Kryder’s Law and Gompertz Law predict a smooth increasing exponential curve for the improvement in performance of various technologies. In contrast, the authors found that the performance of most technologies proceeds in steps (or jumps) of big improvements interspersed with waits (or periods of no growth in performance).

The sweet spot is in knowing which technology to back based on predicting when a new technology is going to have a jump in performance.

“We looked at the forest rather than the trees and see ‘steps’ and ‘waits’ across a variety of technologies,” Tellis said. While no one law applies to every market, Tellis and his co-authors looked at 26 technologies in six markets from lighting to automobile batteries, and found that the SAW model worked in all six, in contrast to several other competing models.

What Tellis and his colleagues did come up with, are average performance improvements for the industry in terms of “steps” and wait times (see table to the right). The challenge for strategists is to invest in various technologies to beat these averages.

Tellis said that tablet and mobile phone manufacturers can leverage this data. “Any manager has first to break down his or her products into components, find components for each technology, and then predict the future path of those technologies. For example, the mobile phone consists of three important technological components: memory, display, or CPU, the first two of which the authors analyzed. Similarly, tablets, manufacturers could rely on the figures for display and memory technologies.”

An example of how the SAW model could have saved a company from decline is Sony’s investment in TVs. Sony kept investing in cathode ray tube technology (CRT) even after liquid crystal display technology (LCD) first crossed CRT in performance in 1996. Instead of considering LCD, Sony introduced the FD Trinitron/WEGA series, a flat version of the CRT. CRT out-performed LCD for a few years, but ultimately lost decisively to LCD in 2001. In contrast, by backing LCD, Samsung grew to be the world’s largest manufacturer of the better performing LCD. The former market leader, Sony, had to seek a joint venture with Samsung in 2006 to manufacture LCDs.

Having the SAW model at the ready might have changed their course. “Prediction of the next step size and wait time using SAW could have helped Sony’s managers make a timely investment in LCD technology,” according to the study.

Journal Reference:

  1. Sood, Ashish, James, Gareth, Tellis, Gerard J. and Zhu, Ji.Predicting the Path of Technological Innovation: SAW Versus Moore, Bass, Gompertz, and KryderMarketing Science., July 22, 2012 [link]

Online Records Could Expose Intimate Details and Personality Traits of Millions (Science Daily)

Mar. 11, 2013 — Research shows that intimate personal attributes can be predicted with high levels of accuracy from ‘traces’ left by seemingly innocuous digital behaviour, in this case Facebook Likes. Study raises important questions about personalised marketing and online privacy.

Research shows that intimate personal attributes can be predicted with high levels of accuracy from ‘traces’ left by seemingly innocuous digital behaviour, in this case Facebook Likes. Study raises important questions about personalised marketing and online privacy. (Credit: Graphic from mypersonality app, Cambridge Psychometrics Centre)

New research, published in the journal Proceedings of the National Academy of Sciences, shows that surprisingly accurate estimates of Facebook users’ race, age, IQ, sexuality, personality, substance use and political views can be inferred from automated analysis of only their Facebook Likes — information currently publicly available by default.

In the study, researchers describe Facebook Likes as a “generic class” of digital record — similar to web search queries and browsing histories — and suggest that such techniques could be used to extract sensitive information for almost anyone regularly online.

Researchers at Cambridge’s Psychometrics Centre, in collaboration with Microsoft Research Cambridge, analysed a dataset of over 58,000 US Facebook users, who volunteered their Likes, demographic profiles and psychometric testing results through the myPersonality application. Users opted in to provide data and gave consent to have profile information recorded for analysis.

Facebook Likes were fed into algorithms and corroborated with information from profiles and personality tests. Researchers created statistical models able to predict personal details using Facebook Likes alone.

Models proved 88% accurate for determining male sexuality, 95% accurate distinguishing African-American from Caucasian American and 85% accurate differentiating Republican from Democrat. Christians and Muslims were correctly classified in 82% of cases, and good prediction accuracy was achieved for relationship status and substance abuse — between 65 and 73%.

But few users clicked Likes explicitly revealing these attributes. For example, less that 5% of gay users clicked obvious Likes such as Gay Marriage. Accurate predictions relied on ‘inference’ — aggregating huge amounts of less informative but more popular Likes such as music and TV shows to produce incisive personal profiles.

Even seemingly opaque personal details such as whether users’ parents separated before the user reached the age of 21 were accurate to 60%, enough to make the information “worthwhile for advertisers,” suggest the researchers.

While they highlight the potential for personalised marketing to improve online services using predictive models, the researchers also warn of the threats posed to users’ privacy.

They argue that many online consumers might feel such levels of digital exposure exceed acceptable limits — as corporations, governments, and even individuals could use predictive software to accurately infer highly sensitive information from Facebook Likes and other digital ‘traces’.

The researchers also tested for personality traits including intelligence, emotional stability, openness and extraversion.

While such latent traits are far more difficult to gauge, the accuracy of the analysis was striking. Study of the openness trait — the spectrum of those who dislike change to those who welcome it — revealed that observation of Likes alone is roughly as informative as using an individual’s actual personality test score.

Some Likes had a strong but seemingly incongruous or random link with a personal attribute, such as Curly Fries with high IQ, or That Spider is More Scared Than U Are with non-smokers.

When taken as a whole, researchers believe that the varying estimations of personal attributes and personality traits gleaned from Facebook Like analysis alone can form surprisingly accurate personal portraits of potentially millions of users worldwide.

They say the results suggest a possible revolution in psychological assessment which — based on this research — could be carried out at an unprecedented scale without costly assessment centres and questionnaires.

“We believe that our results, while based on Facebook Likes, apply to a wider range of online behaviours.” said Michal Kosinski, Operations Director at the Psychometric Centre, who conducted the research with his Cambridge colleague David Stillwell and Thore Graepel from Microsoft Research.

“Similar predictions could be made from all manner of digital data, with this kind of secondary ‘inference’ made with remarkable accuracy — statistically predicting sensitive information people might not want revealed. Given the variety of digital traces people leave behind, it’s becoming increasingly difficult for individuals to control.

“I am a great fan and active user of new amazing technologies, including Facebook. I appreciate automated book recommendations, or Facebook selecting the most relevant stories for my newsfeed,” said Kosinski. “However, I can imagine situations in which the same data and technology is used to predict political views or sexual orientation, posing threats to freedom or even life.”

“Just the possibility of this happening could deter people from using digital technologies and diminish trust between individuals and institutions — hampering technological and economic progress. Users need to be provided with transparency and control over their information.”

Thore Graepel from Microsoft Research said he hoped the research would contribute to the on-going discussions about user privacy:

“Consumers rightly expect strong privacy protection to be built into the products and services they use and this research may well serve as a reminder for consumers to take a careful approach to sharing information online, utilising privacy controls and never sharing content with unfamiliar parties.”

David Stillwell from Cambridge University added: “I have used Facebook since 2005, and I will continue to do so. But I might be more careful to use the privacy settings that Facebook provides.”

Journal Reference:

  1. M. Kosinski, D. Stillwell, T. Graepel. Private traits and attributes are predictable from digital records of human behaviorProceedings of the National Academy of Sciences, 2013; DOI: 10.1073/pnas.1218772110

A Scientist’s Misguided Crusade (N.Y.Times)

OP-ED COLUMNIST

By JOE NOCERA

Published: March 4, 2013 

Last Friday, at 3:40 p.m., the State Department released its “Draft Supplemental Environmental Impact Statement” for the highly contentious Keystone XL pipeline, which Canada hopes to build to move its tar sands oil to refineries in the United States. In effect, the statement said there were no environmental impediments that would prevent President Obama from approving the pipeline.

Two hours and 20 minutes later, I received a blast e-mail containing a statement by James Hansen, the head of the Goddard Institute for Space Studies at NASA — i.e., NASA’s chief climate scientist. “Keystone XL, if the public were to allow our well-oiled government to shepherd it into existence, would be the first step down the wrong road, perpetuating our addiction to dirty fossil fuels, moving to ever dirtier ones,” it began. After claiming that the carbon in the tar sands “exceeds that in all oil burned in human history,” Hansen’s statement concluded: “The public must demand that the government begin serving the public’s interest, not the fossil fuel industry’s interest.”

As a private citizen, Hansen, 71, has the same First Amendment rights as everyone else. He can publicly oppose the Keystone XL pipeline if he so chooses, just as he can be as politically active as he wants to be in the anti-Keystone movement, and even be arrested during protests, something he managed to do recently in front of the White House.

But the blast e-mail didn’t come from James Hansen, private citizen. It specifically identified Hansen as the head of the Goddard Institute, and went on to describe him as someone who “has drawn attention to the danger of passing climate tipping points, producing irreversible climate impacts that would yield a different planet from the one on which civilization developed.” All of which made me wonder whether such apocalyptic pronouncements were the sort of statements a government scientist should be making — and whether they were really helping the cause of reversing climate change.

Let’s acknowledge right here that the morphing of scientists into activists is nothing new. Linus Pauling, the great chemist, was a peace activist who pushed hard for a nuclear test ban treaty. Albert Einstein also became a public opponent of nuclear weapons.

It is also important to acknowledge that Hansen has been a crucial figure in developing modern climate science. In 2009, Eileen Claussen, now the president of the Center for Climate and Energy Solutions, told The New Yorker that Hansen was a “heroic” scientist who “faced all kinds of pressures politically.” Today, his body of work is one of the foundations upon which much climate science is built.

Yet what people hear from Hansen today is not so much his science but his broad, unscientific views on, say, the evils of oil companies. In 2008, he wrote a paper, the thesis of which was that runaway climate change would occur when carbon in the atmosphere reached 350 parts per million — a point it had already exceeded — unless it were quickly reduced. There are many climate change experts who disagree with this judgment — who believe that the 350 number is arbitrary and even meaningless. Yet an entire movement,350.org, has been built around Hansen’s line in the sand.

Meanwhile, he has a department to run. For a midlevel scientist at the Goddard Institute, what signal is Hansen sending when he takes the day off to get arrested at the White House? Do his colleagues feel unfettered in their own work? There is, in fact, enormous resentment toward Hansen inside NASA, where many officials feel that their solid, analytical work on climate science is being lost in what many of them describe as “the Hansen sideshow.” His activism is not really doing any favors for the science his own subordinates are producing.

Finally, and most important, Hansen has placed all his credibility on one battle: the fight to persuade President Obama to block the Keystone XL pipeline. It is the wrong place for him to make a stand. Even in the unlikely event the pipeline is stopped, the tar sands oil will still be extracted and shipped. It might be harder to do without a pipeline, but it is already happening. And in the grand scheme, as I’ve written before, the tar sands oil is not a game changer. The oil we import from Venezuela today is dirtier than that from the tar sands. Not that the anti-pipeline activists seem to care.

What is particularly depressing is that Hansen has some genuinely important ideas, starting with placing a graduated carbon tax on fossil fuels. Such a tax would undoubtedly do far more to reduce carbon emissions and save the planet than stopping the Keystone XL pipeline.

A carbon tax might be worth getting arrested over. But by allowing himself to be distracted by Keystone, Hansen is hurting the very cause he claims to care so much about.

Terra se aproxima de maiores temperaturas em 11 mil anos; Derretimento no Canadá pode ser irreversível (Folha de São Paulo)

JC e-mail 4680, de 08 de Março de 2013.

Salvador Nogueira

Pesquisa reuniu dados de 73 localidades ao redor do mundo para estimar a temperatura global (e local) no período geológico conhecido como Holoceno

Um novo estudo conduzido por pesquisadores da Universidade Estadual do Oregon e da Universidade Harvard, ambas nos EUA, reconstruiu a temperatura média da Terra nos últimos 11,3 mil anos para compará-la aos níveis atuais.

A boa notícia: a Terra hoje está mais fria do que já esteve em sua época mais quente desse período. A má: se os modelos dos climatologistas estiverem certos, atingiremos um novo recorde de calor até o final do século.

O trabalho, publicado na revista “Science”, reuniu dados de 73 localidades ao redor do mundo para estimar a temperatura global (e local) no período geológico conhecido como Holoceno, que começou ao final da última era do gelo, há 11 mil anos.

Depois de consolidar todas as informações, em sua maioria provenientes de amostras de fósseis em sedimentos oceânicos, num único quadro –além de usar técnicas matemáticas para preencher os “buracos” encontrados nas diversas fontes usadas para estimar a temperatura no passado–, os cientistas puderam recriar uma “pequena história da variação climática da Terra”.

Diz-se pequena porque os resultados não permitem enxergar a variação ocorrida em uns poucos anos. É como se cada ponto nos dados representasse a temperatura em um período de 120 anos.

A HISTÓRIA

Os dados confirmam uma velha desconfiança dos cientistas: a de que a Terra passou por um período de aquecimento que começou cerca de 11 mil anos atrás. Em 1,5 mil anos, o planeta esquentou cerca de 0,6ºC e assim se estabilizou, durante cerca de 5.000 anos.

Então, 5,5 mil anos atrás, começou um novo processo de esfriamento –que terminou há 200 anos, com o que ficou conhecido como a “pequena era do gelo”. O planeta ficou 0,7ºC mais frio.

Entram em cena a industrialização acelerada e o século 20. O planeta volta a se esquentar. No momento, ele ainda não bateu o recorde de temperatura visto no início do Holoceno, mas já está mais quente que em 75% dos últimos 11 mil anos.

Assim, o estudo confirma que a temperatura da Terra está subindo em tempos recentes e mostra que a subida é muito mais rápida do que se pensava.

“Essa pesquisa mostra que já experimentamos quase a mesma faixa de mudança de temperatura desde o início da Revolução Industrial que foi vista nos 11 mil anos anteriores da história da Terra –mas essa mudança aconteceu muito mais depressa”, comenta Candace Major, diretor da divisão de Ciências Oceanográficas da Fundação Nacional de Ciência dos EUA, que financiou o estudo.

Por outro lado, a baixa resolução temporal do estudo (é impossível distinguir efeitos de poucos anos) dificulta a comparação com o atual fenômeno de aquecimento.

Para a mudança climática atual se tornar relevante na escala de tempo analisada pelo modelo de reconstrução dos últimos 11 mil anos, ela precisa continuar no próximo século. Segundo os modelos do IPCC (Painel Intergovernamental para Mudança Climática), da ONU, é isso que vai acontecer.

Contudo, ainda há incertezas sobre a magnitude do fenômeno. De toda forma, mesmo pelas estimativas mais otimistas, quando chegarmos a 2100, se nada for feito, provavelmente estaremos vivendo o período mais quente dos últimos 11 mil anos.

* * *

JC e-mail 4680, de 08 de Março de 2013.

via Reuters

As geleiras canadenses, terceiro maior depósito de gelo depois da Antártida e da Groenlândia, podem estar sofrendo um derretimento sem volta que deve aumentar o nível do mar, afirmaram cientistas

Cerca de 20% das geleiras no norte do Canadá podem desaparecer até o fim do século 21, num derretimento que pode acrescentar 3,5 cm ao nível do mar.

Segundo artigo na revista “Geophysical Research Letters”, o derretimento de geleiras brancas exporia a tundra escura, que tende a absorver mais calor e acelerar o derretimento.

A ONU estima um aumento do nível do mar entre 18 cm e 59 cm neste século ou mais se a cobertura de gelo da Antártida e da Groenlândia começar a derreter mais rápido.

A projeção de perda de 20% do volume de gelo no Canadá se baseou em um cenário com aumento de temperatura médio de 3ºC neste século e de 8ºC no Ártico canadense, dentro das previsões da ONU.

Nobel de Química fala sobre a ‘magia da ciência’ em São Carlos (Fapesp)

Na palestra de abertura do simpósio em homenagem ao professor do MIT Daniel Kleppner, Dudley Herschbach, ganhador do prêmio de Química em 1986, apresentou parábolas para ilustrar o que a química é capaz de fazer (foto:Silvio Pires/FAPESP)

28/02/2013

Por Karina Toledo

Agência FAPESP – Com uma palestra intitulada “Glimpses of Chemical Wizardry” (Vislumbres da Magia da Química), o norte-americano Dudley Herschbach – ganhador do prêmio Nobel de Química de 1986 – deu início às atividades de um simpósioque reúne esta semana grandes nomes da ciência mundial em São Carlos, no interior de São Paulo.

A um auditório repleto de estudantes, principalmente dos cursos de Física, Química e Ciências Biológicas da Universidade Federal de São Carlos (UFSCar), Herschbach apresentou três “parábolas moleculares” com o intuito de mostrar algumas das coisas espetaculares que a ciência é capaz de fazer.

Em uma das histórias, intitulada “A vida em turnê no interior das células”, Herschbach falou sobre técnicas avançadas de microscopia com super-resolução desenvolvidas por Xiaowei Zhuang, pesquisadora da Universidade Harvard, que permitem, por exemplo, estudar a interação entre células e a expressão de genes em tempo real.

“A ciência faz coisas que realmente pareciam impossíveis antes de acontecerem. De vez em quando, alguém, em alguma parte do mundo, faz algo mágico e muda as coisas. É maravilhoso saber que você faz parte disso. É parte da recompensa da ciência que você não tem na maioria das profissões”, disse Herschbach à Agência FAPESP.

Graduado em Matemática pela Universidade Stanford, Herschbach fez mestrado em Física e em Química, além de doutorado em Físico-Química pela Universidade Harvard, onde hoje é professor.

“Fui o primeiro da minha família a ir para a universidade. Ofereceram-me uma bolsa para jogar futebol [norte-americano], mas acabei trocando por uma bolsa acadêmica, pois o técnico havia me proibido de frequentar as aulas de laboratório para não me atrasar para os treinos. A verdade é que eu achava a ciência muito mais fascinante”, contou.

Nos anos 1960, o cientista conduziu experimentos pioneiros com a técnica de feixes moleculares cruzados para estudar reações químicas e a dinâmica dos átomos das moléculas em tempo real. Por suas pesquisas nesse campo, recebeu em 1986 – junto com o taiwanês Yuan Lee e o canadense John Polanyi – o Nobel de Química.

Os resultados foram de grande importância para o desenvolvimento de um novo campo de pesquisa — o da dinâmica de reação — e proporcionaram um entendimento detalhado de como as reações químicas acontecem.

“Quando olho no espelho, ao me barbear, percebo que ganhar o Nobel não mudou nada em mim. A única diferença é que as pessoas ficaram mais interessadas no que tenho a dizer. Convidam-me para palestras e entrevistas. E isso acabou me transformando numa espécie de embaixador da ciência”, disse Herschbach.

Poesia em sala de aula

Durante toda a apresentação, Herschbach combateu o mito de que ciência é algo muito difícil, reservado para os muito inteligentes. “Costumo ouvir pessoas dizendo que é preciso ser muito bom em matemática para ser um bom pesquisador, mas a maioria dos cientistas usa a mesma matemática que um caixa de supermercado. Você não precisa ser bom em tudo, apenas em uma coisa, achar um nicho”, afirmou.

Ao comparar a ciência com outras atividades humanas, Herschbach disse que, em nenhuma outra profissão, você pode falhar inúmeras vezes e ainda ser aplaudido quando consegue fazer alguma coisa certa. “Um músico pode tocar quase todas as notas certas em um concerto e ser criticado por ter errado apenas algumas”, comparou.

Herschbach contou que costumava pedir a seus alunos que escrevessem poemas para lhes mostrar que é mais importante se preocupar em fazer as perguntas certas do que encontrar a resposta certa.

“Isso, mais do que resolver equações, é como fazer ciência de verdade. Ninguém diz se um poema está certo ou errado e sim o quanto ele é capaz de abrir seus olhos para algo que parecia ordinário, fazer você enxergar aquilo de outra forma. É assim com a ciência. Se você faz pesquisa de fronteira, coisas novas, é muito artístico. Quero que os estudantes percebam que eles também podem ser feiticeiros”, concluiu.

O Simpósio em Homenagem ao Prof. Daniel Kleppner “Física atômica e áreas correlatas”, que termina no dia 1º de março, é promovido pelo Centro de Pesquisa em Óptica e Fotônica (Cepof) de São Carlos, um dos Centros de Pesquisa, Inovação e Difusão (CEPID) financiados pela FAPESP.

O objetivo do encontro é prestar uma homenagem ao físico norte-americano Daniel Kleppner, do Instituto de Tecnologia de Massachusetts (MIT), que receberá o título de professor honorário do Instituto de Física de São Carlos, da Universidade de São Paulo (IFSC-USP).

Além de Herschbach, amigo de Kleppner desde os tempos da graduação, outros quatro ganhadores do Nobel também participam do evento: Serge Haroche (Nobel de Física 2012), David Wineland (Nobel de Física 2012), Eric Cornell (Nobel de Física 2001) e William Phillips (Nobel de Física 1997).

Richard A. Muller: The Conversion of a Climate-Change Skeptic (N.Y.Times)

OP-ED CONTRIBUTOR

By RICHARD A. MULLER

Published: July 28, 2012

Berkeley, Calif.

CALL me a converted skeptic. Three years ago I identified problems in previous climate studies that, in my mind, threw doubt on the very existence of global warming. Last year, following an intensive research effort involving a dozen scientists, I concluded that global warming was real and that the prior estimates of the rate of warming were correct. I’m now going a step further: Humans are almost entirely the cause.

My total turnaround, in such a short time, is the result of careful and objective analysis by the Berkeley Earth Surface Temperature project, which I founded with my daughter Elizabeth. Our results show that the average temperature of the earth’s land has risen by two and a half degrees Fahrenheit over the past 250 years, including an increase of one and a half degrees over the most recent 50 years. Moreover, it appears likely that essentially all of this increase results from the human emission of greenhouse gases.

These findings are stronger than those of the Intergovernmental Panel on Climate Change, the United Nations group that defines the scientific and diplomatic consensus on global warming. In its 2007 report, the I.P.C.C. concluded only that most of the warming of the prior 50 years could be attributed to humans. It was possible, according to the I.P.C.C. consensus statement, that the warming before 1956 could be because of changes in solar activity, and that even a substantial part of the more recent warming could be natural.

Our Berkeley Earth approach used sophisticated statistical methods developed largely by our lead scientist, Robert Rohde, which allowed us to determine earth land temperature much further back in time. We carefully studied issues raised by skeptics: biases from urban heating (we duplicated our results using rural data alone), from data selection (prior groups selected fewer than 20 percent of the available temperature stations; we used virtually 100 percent), from poor station quality (we separately analyzed good stations and poor ones) and from human intervention and data adjustment (our work is completely automated and hands-off). In our papers we demonstrate that none of these potentially troublesome effects unduly biased our conclusions.

The historic temperature pattern we observed has abrupt dips that match the emissions of known explosive volcanic eruptions; the particulates from such events reflect sunlight, make for beautiful sunsets and cool the earth’s surface for a few years. There are small, rapid variations attributable to El Niño and other ocean currents such as the Gulf Stream; because of such oscillations, the “flattening” of the recent temperature rise that some people claim is not, in our view, statistically significant. What has caused the gradual but systematic rise of two and a half degrees? We tried fitting the shape to simple math functions (exponentials, polynomials), to solar activity and even to rising functions like world population. By far the best match was to the record of atmospheric carbon dioxide, measured from atmospheric samples and air trapped in polar ice.

Just as important, our record is long enough that we could search for the fingerprint of solar variability, based on the historical record of sunspots. That fingerprint is absent. Although the I.P.C.C. allowed for the possibility that variations in sunlight could have ended the “Little Ice Age,” a period of cooling from the 14th century to about 1850, our data argues strongly that the temperature rise of the past 250 years cannot be attributed to solar changes. This conclusion is, in retrospect, not too surprising; we’ve learned from satellite measurements that solar activity changes the brightness of the sun very little.

How definite is the attribution to humans? The carbon dioxide curve gives a better match than anything else we’ve tried. Its magnitude is consistent with the calculated greenhouse effect — extra warming from trapped heat radiation. These facts don’t prove causality and they shouldn’t end skepticism, but they raise the bar: to be considered seriously, an alternative explanation must match the data at least as well as carbon dioxide does. Adding methane, a second greenhouse gas, to our analysis doesn’t change the results. Moreover, our analysis does not depend on large, complex global climate models, the huge computer programs that are notorious for their hidden assumptions and adjustable parameters. Our result is based simply on the close agreement between the shape of the observed temperature rise and the known greenhouse gas increase.

It’s a scientist’s duty to be properly skeptical. I still find that much, if not most, of what is attributed to climate change is speculative, exaggerated or just plain wrong. I’ve analyzed some of the most alarmist claims, and my skepticism about them hasn’t changed.

Hurricane Katrina cannot be attributed to global warming. The number of hurricanes hitting the United States has been going down, not up; likewise for intense tornadoes. Polar bears aren’t dying from receding ice, and the Himalayan glaciers aren’t going to melt by 2035. And it’s possible that we are currently no warmer than we were a thousand years ago, during the “Medieval Warm Period” or “Medieval Optimum,” an interval of warm conditions known from historical records and indirect evidence like tree rings. And the recent warm spell in the United States happens to be more than offset by cooling elsewhere in the world, so its link to “global” warming is weaker than tenuous.

The careful analysis by our team is laid out in five scientific papers now online at BerkeleyEarth.org. That site also shows our chart of temperature from 1753 to the present, with its clear fingerprint of volcanoes and carbon dioxide, but containing no component that matches solar activity. Four of our papers have undergone extensive scrutiny by the scientific community, and the newest, a paper with the analysis of the human component, is now posted, along with the data and computer programs used. Such transparency is the heart of the scientific method; if you find our conclusions implausible, tell us of any errors of data or analysis.

What about the future? As carbon dioxide emissions increase, the temperature should continue to rise. I expect the rate of warming to proceed at a steady pace, about one and a half degrees over land in the next 50 years, less if the oceans are included. But if China continues its rapid economic growth (it has averaged 10 percent per year over the last 20 years) and its vast use of coal (it typically adds one new gigawatt per month), then that same warming could take place in less than 20 years.

Science is that narrow realm of knowledge that, in principle, is universally accepted. I embarked on this analysis to answer questions that, to my mind, had not been answered. I hope that the Berkeley Earth analysis will help settle the scientific debate regarding global warming and its human causes. Then comes the difficult part: agreeing across the political and diplomatic spectrum about what can and should be done.

Richard A. Muller, a professor of physics at the University of California, Berkeley, and a former MacArthur Foundation fellow, is the author, most recently, of “Energy for Future Presidents: The Science Behind the Headlines.”

Power of Suggestion (The Chronicle of Higher Education)

January 30, 2013

The amazing influence of unconscious cues is among the most fascinating discoveries of our time­—that is, if it’s true

By Tom Bartlett

New Haven, Conn.

Power of SuggestionMark Abramson for The Chronicle Review. John Bargh rocked the world of social psychology with experiments that showed the power of unconscious cues over our behavior.

Aframed print of “The Garden of Earthly Delights” hangs above the moss-green, L-shaped sectional in John Bargh’s office on the third floor of Yale University’s Kirtland Hall. Hieronymus Bosch’s famous triptych imagines a natural environment that is like ours (water, flowers) yet not (enormous spiked and translucent orbs). What precisely the 15th-century Dutch master had in mind is still a mystery, though theories abound. On the left is presumably paradise, in the middle is the world, and on the right is hell, complete with knife-faced monster and human-devouring bird devil.

By Bosch’s standard, it’s too much to say the past year has been hellish for Bargh, but it hasn’t been paradise either. Along with personal upheaval, including a lengthy child-custody battle, he has coped with what amounts to an assault on his life’s work, the research that pushed him into prominence, the studies that Malcolm Gladwell called “fascinating” and Daniel Kahneman deemed “classic.” What was once widely praised is now being pilloried in some quarters as emblematic of the shoddiness and shallowness of social psychology. When Bargh responded to one such salvo with a couple of sarcastic blog posts, he was ridiculed as going on a “one-man rampage.” He took the posts down and regrets writing them, but his frustration and sadness at how he’s been treated remain.

Psychology may be simultaneously at the highest and lowest point in its history. Right now its niftiest findings are routinely simplified and repackaged for a mass audience; if you wish to publish a best seller sans bloodsucking or light bondage, you would be well advised to match a few dozen psychological papers with relatable anecdotes and a grabby, one-word title. That isn’t true across the board. Researchers engaged in more technical work on, say, the role of grapheme units in word recognition must comfort themselves with the knowledge that science is, by its nature, incremental. But a social psychologist with a sexy theory has star potential. In the last decade or so, researchers have made astonishing discoveries about the role of consciousness, the reasons for human behavior, the motivations for why we do what we do. This stuff is anything but incremental.

At the same time, psychology has been beset with scandal and doubt. Formerly high-flying researchers like Diederik Stapel, Marc Hauser, and Dirk Smeesters saw their careers implode after allegations that they had cooked their results and managed to slip them past the supposedly watchful eyes of peer reviewers. Psychology isn’t the only field with fakers, but it has its share. Plus there’s the so-called file-drawer problem, that is, the tendency for researchers to publish their singular successes and ignore their multiple failures, making a fluke look like a breakthrough. Fairly or not, social psychologists are perceived to be less rigorous in their methods, generally not replicating their own or one another’s work, instead pressing on toward the next headline-making outcome.

Much of the criticism has been directed at priming. The definitions get dicey here because the term can refer to a range of phenomena, some of which are grounded in decades of solid evidence—like the “anchoring effect,” which happens, for instance, when a store lists a competitor’s inflated price next to its own to make you think you’re getting a bargain. That works. The studies that raise eyebrows are mostly in an area known as behavioral or goal priming, research that demonstrates how subliminal prompts can make you do all manner of crazy things. A warm mug makes you friendlier. The American flag makes you vote Republican. Fast-food logos make you impatient. A small group of skeptical psychologists—let’s call them the Replicators—have been trying to reproduce some of the most popular priming effects in their own labs.

What have they found? Mostly that they can’t get those results. The studies don’t check out. Something is wrong. And because he is undoubtedly the biggest name in the field, the Replicators have paid special attention to John Bargh and the study that started it all.

As in so many other famous psychological experiments, the researcher lies to the subject. After rearranging lists of words into sensible sentences, the subject—a New York University undergraduate—is told that the experiment is about language ability. It is not. In fact, the real test doesn’t begin until the subject exits the room. In the hallway is a graduate student with a stopwatch hidden beneath her coat. She’s pretending to wait for a meeting but really she’s working with the researchers. She times how long it takes the subject to walk from the doorway to a strip of silver tape a little more than 30 feet down the corridor. The experiment hinges on that stopwatch.

The words the subject was asked to rearrange were not random, though they seemed that way (this was confirmed in postexperiment interviews with each subject). They were words like “bingo” and “Florida,” “knits” and “wrinkles,” “bitter” and “alone.” Reading the list, you can almost picture a stooped senior padding around a condo, complaining at the television. A control group unscrambled words that evoked no theme. When the walking times of the two groups were compared, the Florida-knits-alone subjects walked, on average, more slowly than the control group. Words on a page made them act old.

It’s a cute finding. But the more you think about it, the more serious it starts to seem. What if we are constantly being influenced by subtle, unnoticed cues? If “Florida” makes you sluggish, could “cheetah” make you fleet of foot? Forget walking speeds. Is our environment making us meaner or more creative or stupider without our realizing it? We like to think we’re steering the ship of self, but what if we’re actually getting blown about by ghostly gusts?

John Bargh and his co-authors, Mark Chen and Lara Burrows, performed that experiment in 1990 or 1991. They didn’t publish it until 1996. Why sit on such a fascinating result? For starters, they wanted to do it again, which they did. They also wanted to perform similar experiments with different cues. One of those other experiments tested subjects to see if they were more hostile when primed with an African-American face. They were. (The subjects were not African-American.) In the other experiment, the subjects were primed with rude words to see if that would make them more likely to interrupt a conversation. It did.

The researchers waited to publish until other labs had found the same type of results. They knew their finding would be controversial. They knew many people wouldn’t believe it. They were willing to stick their necks out, but they didn’t want to be the only ones.

Since that study was published in the Journal of Personality and Social Psychology,it has been cited more than 2,000 times. Though other researchers did similar work at around the same time, and even before, it was that paper that sparked the priming era. Its authors knew, even before it was published, that the paper was likely to catch fire. They wrote: “The implications for many social psychological phenomena … would appear to be considerable.” Translation: This is a huge deal.

When he was 9 or 10, Bargh decided to become a psychologist. He was in the kitchen of his family’s house in Champaign, Ill., when this revelation came to him. He didn’t know everything that would entail, of course, or what exactly a psychologist did, but he wanted to understand more about human emotion because it was this “mysterious powerful influence on everything.” His dad was an administrator at the University of Illinois, and so he was familiar with university campuses. He liked them. He still does. When he was in high school, he remembers arguing about B.F. Skinner. Everyone else in the class thought Skinner’s ideas were ridiculous. Bargh took the other side, not so much because he embraced the philosophy of radical behaviorism or enjoyed Skinner’s popular writings. It was more because he reveled in contrarianism. “This guy is thinking something nobody else agrees with,” he says now. “Let’s consider that he might be right.”

I met Bargh on a Thursday morning a couple of weeks before Christmas. He was dressed in cable-knit and worn jeans with hiking boots. At 58 he still has a full head of dark, appropriately mussed-up hair. Bargh was reclining on the previously mentioned moss-green sectional while downing coffee to stay alert as he whittled away at a thick stack of finals papers. He rose to greet me, sat back down, and sighed.

The last year has been tough for Bargh. Professionally, the nadir probably came in January, when a failed replication of the famous elderly-walking study was published in the journal PLoS ONE. It was not the first failed replication, but this one stung. In the experiment, the researchers had tried to mirror Bargh’s methods with an important exception: Rather than stopwatches, they used automatic timing devices with infrared sensors to eliminate any potential bias. The words didn’t make subjects act old. They tried the experiment again with stopwatches and added a twist: They told those operating the stopwatches which subjects were expected to walk slowly. Then it worked. The title of their paper tells the story: “Behavioral Priming: It’s All in the Mind, but Whose Mind?”

The paper annoyed Bargh. He thought the researchers didn’t faithfully follow his methods section, despite their claims that they did. But what really set him off was a blog post that explained the results. The post, on the blog Not Exactly Rocket Science, compared what happened in the experiment to the notorious case of Clever Hans, the horse that could supposedly count. It was thought that Hans was a whiz with figures, stomping a hoof in response to mathematical queries. In reality, the horse was picking up on body language from its handler. Bargh was the deluded horse handler in this scenario. That didn’t sit well with him. If the PLoS ONE paper is correct, the significance of his experiment largely dissipates. What’s more, he looks like a fool, tricked by a fairly obvious flaw in the setup.

Bargh responded in two long, detailed posts on his rarely updated Psychology Todayblog. He spelled out the errors he believed were made in the PLoS ONE paper. Most crucially, he wrote, in the original experiment there was no way for the graduate student with the stopwatch to know who was supposed to walk slowly and who wasn’t. The posts were less temperate than most public discourse in science, but they were hardly mouth-foaming rants. He referred to “incompetent or ill-informed researchers,” clearly a shot at the paper’s authors. He mocked the journal where the replication was published as “pay to play” and lacking the oversight of traditional journals. The title of the post, “Nothing in Their Heads,” while perhaps a reference to unconscious behavior, seemed less than collegial.

He also expressed concern for readers who count on “supposedly reputable online media sources for accurate information on psychological science.” This was a dig at the blog post’s author, Ed Yong, who Bargh believes had written an unfair piece. “I was hurt by the things that were said, not just in the article, but in Ed Yong’s coverage of it,” Bargh says now. Yong’s post was more, though, than a credulous summary of the study. He interviewed researchers and provided context. The headline, “Why a classic psychology experiment isn’t what it seemed,” might benefit from softening, but if you’re looking for an example of sloppy journalism, this ain’t it.

While Bargh was dismayed by the paper and the publicity, the authors of the replication were equally taken aback by the severity of Bargh’s reaction. “That really threw us off, that response,” says Axel Cleeremans, a professor of cognitive science at the Université Libre de Bruxelles. “It was obvious that he was so dismissive, it was close to frankly insulting. He described us as amateur experimentalists, which everyone knows we are not.” Nor did they feel that his critique of their methods was valid. Even so, they tried the experiment again, taking into account Bargh’s concerns. It still didn’t work.

Bargh took his blog posts down after they were criticized. Though his views haven’t changed, he feels bad about his tone. In our conversations over the last month or so, Bargh has at times vigorously defended his work, pointing to a review he published recently in Trends in Cognitive Sciences that marshals recent priming studies into a kind of state-of-the-field address. Short version: Science marches on, priming’s doing great.

He complains that he has been a victim of scientific bullying (and some sympathetic toward Bargh use that phrase, too). There are other times, though, when he just seems crushed. “You invest your whole career and life in something, and to have this happen near the end of it—it’s very hard to take,” he says. Priming is what Bargh is known for. When he says “my name is a symbol that stands for these kinds of effects,” he’s not being arrogant. That’s a fact. Before the 1996 paper, he had already published respected and much-cited work on unconscious, automatic mental processes, but priming has defined him. In an interview on the Web site Edge a few years ago, back before the onslaught, he explained his research goals: “We have a trajectory downward, always downward, trying to find simple, basic causes and with big effects. We’re looking for simple things—not anything complicated—simple processes or concepts that then have profound effects.” The article labeled him “the simplifier.”

When I ask if he still believes in these effects, he says yes. They have been replicated in multiple labs. Some of those replications have been exact: stopwatch, the same set of words, and so on. Others have been conceptual. While they explore the same idea, maybe the study is about handwriting rather than walking. Maybe it’s about obesity rather than elderly stereotypes. But the gist is the same. “It’s not just my work that’s under attack here,” Bargh says. “It’s lots of people’s research being attacked and dismissed.” He has moments of doubt. How could he not? It’s deeply unsettling to have someone scrutinizing your old papers, looking for inconsistencies, even if you’re fairly confident about what you’ve accomplished. “Maybe there’s something we were doing that I didn’t realize,” he says, explaining the thoughts that have gone through his head. “You start doing that examination.”

So why not do an actual examination? Set up the same experiments again, with additional safeguards. It wouldn’t be terribly costly. No need for a grant to get undergraduates to unscramble sentences and stroll down a hallway. Bargh says he wouldn’t want to force his graduate students, already worried about their job prospects, to spend time on research that carries a stigma. Also, he is aware that some critics believe he’s been pulling tricks, that he has a “special touch” when it comes to priming, a comment that sounds like a compliment but isn’t. “I don’t think anyone would believe me,” he says.

Harold Pashler wouldn’t. Pashler, a professor of psychology at the University of California at San Diego, is the most prolific of the Replicators. He started trying priming experiments about four years ago because, he says, “I wanted to see these effects for myself.” That’s a diplomatic way of saying he thought they were fishy. He’s tried more than a dozen so far, including the elderly-walking study. He’s never been able to achieve the same results. Not once.

This fall, Daniel Kahneman, the Nobel Prize-winning psychologist, sent an e-mail to a small group of psychologists, including Bargh, warning of a “train wreck looming” in the field because of doubts surrounding priming research. He was blunt: “I believe that you should collectively do something about this mess. To deal effectively with the doubts you should acknowledge their existence and confront them straight on, because a posture of defiant denial is self-defeating,” he wrote.

Strongly worded e-mails from Nobel laureates tend to get noticed, and this one did. He sent it after conversations with Bargh about the relentless attacks on priming research. Kahneman cast himself as a mediator, a sort of senior statesman, endeavoring to bring together believers and skeptics. He does have a dog in the fight, though: Kahneman believes in these effects and has written admiringly of Bargh, including in his best seller Thinking, Fast and Slow.

On the heels of that message from on high, an e-mail dialogue began between the two camps. The vibe was more conciliatory than what you hear when researchers are speaking off the cuff and off the record. There was talk of the type of collaboration that Kahneman had floated, researchers from opposing sides combining their efforts in the name of truth. It was very civil, and it didn’t lead anywhere.

In one of those e-mails, Pashler issued a challenge masquerading as a gentle query: “Would you be able to suggest one or two goal priming effects that you think are especially strong and robust, even if they are not particularly well-known?” In other words, put up or shut up. Point me to the stuff you’re certain of and I’ll try to replicate it. This was intended to counter the charge that he and others were cherry-picking the weakest work and then doing a victory dance after demolishing it. He didn’t get the straightforward answer he wanted. “Some suggestions emerged but none were pointing to a concrete example,” he says.

One possible explanation for why these studies continually and bewilderingly fail to replicate is that they have hidden moderators, sensitive conditions that make them a challenge to pull off. Pashler argues that the studies never suggest that. He wrote in that same e-mail: “So from our reading of the literature, it is not clear why the results should be subtle or fragile.”

Bargh contends that we know more about these effects than we did in the 1990s, that they’re more complicated than researchers had originally assumed. That’s not a problem, it’s progress. And if you aren’t familiar with the literature in social psychology, with the numerous experiments that have modified and sharpened those early conclusions, you’re unlikely to successfully replicate them. Then you will trot out your failure as evidence that the study is bogus when really what you’ve proved is that you’re no good at social psychology.

Pashler can’t quite disguise his disdain for such a defense. “That doesn’t make sense to me,” he says. “You published it. That must mean you think it is a repeatable piece of work. Why can’t we do it just the way you did it?”

That’s how David Shanks sees things. He, too, has been trying to replicate well-known priming studies, and he, too, has been unable to do so. In a forthcoming paper, Shanks, a professor of psychology at University College London, recounts his and his several co-authors’ attempts to replicate one of the most intriguing effects, the so-called professor prime. In the study, one group was told to imagine a professor’s life and then list the traits that brought to mind. Another group was told to do the same except with a soccer hooligan rather than a professor.

The groups were then asked questions selected from the board game Trivial Pursuit, questions like “Who painted ‘Guernica’?” and “What is the capital of Bangladesh?” (Picasso and Dhaka, for those playing at home.) Their scores were then tallied. The subjects who imagined the professor scored above a control group that wasn’t primed. The subjects who imagined soccer hooligans scored below the professor group and below the control. Thinking about a professor makes you smart while thinking about a hooligan makes you dumb. The study has been replicated a number of times, including once on Dutch television.

Shanks can’t get the result. And, boy, has he tried. Not once or twice, but nine times.

The skepticism about priming, says Shanks, isn’t limited to those who have committed themselves to reperforming these experiments. It’s not only the Replicators. “I think more people in academic psychology than you would imagine appreciate the historical implausibility of these findings, and it’s just that those are the opinions that they have over the water fountain,” he says. “They’re not the opinions that get into the journalism.”

Like all the skeptics I spoke with, Shanks believes the worst is yet to come for priming, predicting that “over the next two or three years you’re going to see an avalanche of failed replications published.” The avalanche may come sooner than that. There are failed replications in press at the moment and many more that have been completed (Shanks’s paper on the professor prime is in press at PLoS ONE). A couple of researchers I spoke with didn’t want to talk about their results until they had been peer reviewed, but their preliminary results are not encouraging.

Ap Dijksterhuis is the author of the professor-prime paper. At first, Dijksterhuis, a professor of psychology at Radboud University Nij­megen, in the Netherlands, wasn’t sure he wanted to be interviewed for this article. That study is ancient news—it was published in 1998, and he’s moved away from studying unconscious processes in the last couple of years, in part because he wanted to move on to new research on happiness and in part because of the rancor and suspicion that now accompany such work. He’s tired of it.

The outing of Diederik Stapel made the atmosphere worse. Stapel was a social psychologist at Tilburg University, also in the Netherlands, who was found to have committed scientific misconduct in scores of papers. The scope and the depth of the fraud were jaw-dropping, and it changed the conversation. “It wasn’t about research practices that could have been better. It was about fraud,” Dijksterhuis says of the Stapel scandal. “I think that’s playing in the background. It now almost feels as if people who do find significant data are making mistakes, are doing bad research, and maybe even doing fraudulent things.”

In the e-mail discussion spurred by Kahneman’s call to action, Dijk­sterhuis laid out a number of possible explanations for why skeptics were coming up empty when they attempted priming studies. Cultural differences, for example. Studying prejudice in the Netherlands is different from studying it in the United States. Certain subjects are not susceptible to certain primes, particularly a subject who is unusually self-aware. In an interview, he offered another, less charitable possibility. “It could be that they are bad experimenters,” he says. “They may turn out failures to replicate that have been shown by 15 or 20 people already. It basically shows that it’s something with them, and it’s something going on in their labs.”

Joseph Cesario is somewhere between a believer and a skeptic, though these days he’s leaning more skeptic. Cesario is a social psychologist at Michigan State University, and he’s successfully replicated Bargh’s elderly-walking study, discovering in the course of the experiment that the attitude of a subject toward the elderly determined whether the effect worked or not. If you hate old people, you won’t slow down. He is sympathetic to the argument that moderators exist that make these studies hard to replicate, lots of little monkey wrenches ready to ruin the works. But that argument only goes so far. “At some point, it becomes excuse-making,” he says. “We have to have some threshold where we say that it doesn’t exist. It can’t be the case that some small group of people keep hitting on the right moderators over and over again.”

Cesario has been trying to replicate a recent finding of Bargh’s. In that study, published last year in the journal Emotion, Bargh and his co-author, Idit Shalev, asked subjects about their personal hygiene habits—how often they showered and bathed, for how long, how warm they liked the water. They also had subjects take a standard test to determine their degree of social isolation, whether they were lonely or not. What they found is that lonely people took longer and warmer baths and showers, perhaps substituting the warmth of the water for the warmth of regular human interaction.

That isn’t priming, exactly, though it is a related unconscious phenomenon often called embodied cognition. As in the elderly-walking study, the subjects didn’t realize what they were doing, didn’t know they were bathing longer because they were lonely. Can warm water alleviate feelings of isolation? This was a result with real-world applications, and reporters jumped on it. “Wash the loneliness away with a long, hot bath,” read an NBC News headline.

Bargh’s study had 92 subjects. So far Cesario has run more than 2,500 through the same experiment. He’s found absolutely no relationship between bathing and loneliness. Zero. “It’s very worrisome if you have people thinking they can take a shower and they can cure their depression,” he says. And he says Bargh’s data are troublesome. “Extremely small samples, extremely large effects—that’s a red flag,” he says. “It’s not a red flag for people publishing those studies, but it should be.”

Even though he is, in a sense, taking aim at Bargh, Cesario thinks it’s a shame that the debate over priming has become so personal, as if it’s a referendum on one man. “He has the most eye-catching findings. He always has,” Cesario says. “To the extent that some of his effects don’t replicate, because he’s identified as priming, it casts doubt on the entire body of research. He is priming.”

That has been the narrative. Bargh’s research is crumbling under scrutiny and, along with it, perhaps priming as a whole. Maybe the most exciting aspect of social psychology over the last couple of decades, these almost magical experiments in which people are prompted to be smarter or slower without them even knowing it, will end up as an embarrassing footnote rather than a landmark achievement.

Then along comes Gary Latham.

Latham, an organizational psychologist in the management school at the University of Toronto, thought the research Bargh and others did was crap. That’s the word he used. He told one of his graduate students, Amanda Shantz, that if she tried to apply Bargh’s principles it would be a win-win. If it failed, they could publish a useful takedown. If it succeeded … well, that would be interesting.

They performed a pilot study, which involved showing subjects a photo of a woman winning a race before the subjects took part in a brainstorming task. As Bargh’s research would predict, the photo made them perform better at the brainstorming task. Or seemed to. Latham performed the experiment again in cooperation with another lab. This time the study involved employees in a university fund-raising call center. They were divided into three groups. Each group was given a fact sheet that would be visible while they made phone calls. In the upper left-hand corner of the fact sheet was either a photo of a woman winning a race, a generic photo of employees at a call center, or no photo. Again, consistent with Bargh, the subjects who were primed raised more money. Those with the photo of call-center employees raised the most, while those with the race-winner photo came in second, both outpacing the photo-less control. This was true even though, when questioned afterward, the subjects said they had been too busy to notice the photos.

Latham didn’t want Bargh to be right. “I couldn’t have been more skeptical or more disbelieving when I started the research,” he says. “I nearly fell off my chair when my data” supported Bargh’s findings.

That experiment has changed Latham’s opinion of priming and has him wondering now about the applications for unconscious primes in our daily lives. Are there photos that would make people be safer at work? Are there photos that undermine performance? How should we be fine-tuning the images that surround us? “It’s almost scary in lots of ways that these primes in these environments can affect us without us being aware,” he says. Latham hasn’t stopped there. He’s continued to try experiments using Bargh’s ideas, and those results have only strengthened his confidence in priming. “I’ve got two more that are just mind-blowing,” he says. “And I know John Bargh doesn’t know about them, but he’ll be a happy guy when he sees them.”

Latham doesn’t know why others have had trouble. He only knows what he’s found, and he’s certain about his own data. In the end, Latham thinks Bargh will be vindicated as a pioneer in understanding unconscious motivations. “I’m like a converted Christian,” he says. “I started out as a devout atheist, and now I’m a believer.”

Following his come-to-Jesus transformation, Latham sent an e-mail to Bargh to let him know about the call-center experiment. When I brought this up with Bargh, his face brightened slightly for the first time in our conversation. “You can imagine how that helped me,” he says. He had been feeling isolated, under siege, worried that his legacy was becoming a cautionary tale. “You feel like you’re on an island,” he says.

Though Latham is now a believer, he remains the exception. With more failed replications in the pipeline, Dijksterhuis believes that Kahneman’s looming-train-wreck letter, though well meaning, may become a self-fulfilling prophecy, helping to sink the field rather than save it. Perhaps the perception has already become so negative that further replications, regardless of what they find, won’t matter much. For his part, Bargh is trying to take the long view. “We have to think about 50 or 100 years from now—are people going to believe the same theories?” he says. “Maybe it’s not true. Let’s see if it is or isn’t.”

Tom Bartlett is a senior writer at The Chronicle.

Neuroscientists Pinpoint Location of Fear Memory in Amygdala (Science Daily)

Jan. 27, 2013 — A rustle of undergrowth in the outback: it’s a sound that might make an animal or person stop sharply and be still, in the anticipation of a predator. That “freezing” is part of the fear response, a reaction to a stimulus in the environment and part of the brain’s determination of whether to be afraid of it.

An image showing neurons in the lateral subdivision of the central amygdala (CeL). In red are somatostain-positive (SOM+) neurons, which control fear; in green are another set of neurons known as PKC-delta cells. (Credit: Image courtesy of Bo Li)

A neuroscience group at Cold Spring Harbor Laboratory (CSHL) led by Assistant Professor Bo Li Ph.D., together with collaborator Professor Z. Josh Huang Ph.D., have just released the results of a new study that examines the how fear responses are learned, controlled, and memorized. They show that a particular class of neurons in a subdivision of the amygdala plays an active role in these processes.

Locating fear memory in the amygdala

Previous research had indicated that structures inside the amygdalae, a pair of almond-shaped formations that sit deep within the brain and are known to be involved in emotion and reward-based behavior, may be part of the circuit that controls fear learning and memory. In particular, a region called the central amygdala, or CeA, was thought to be a passive relay for the signals relayed within this circuit.

Li’s lab became interested when they observed that neurons in a region of the central amygdala called the lateral subdivision, or CeL, “lit up” in a particular strain of mice while studying this circuit.

“Neuroscientists believed that changes in the strength of the connections onto neurons in the central amygdala must occur for fear memory to be encoded,” Li says, “but nobody had been able to actually show this.”

This led the team to further probe into the role of these neurons in fear responses and furthermore to ask the question: If the central amygdala stores fear memory, how is that memory trace read out and translated into fear responses?

To examine the behavior of mice undergoing a fear test the team first trained them to respond in a Pavlovian manner to an auditory cue. The mice began to “freeze,” a very common fear response, whenever they heard one of the sounds they had been trained to fear.

To study the particular neurons involved, and to understand them in relation to the fear-inducing auditory cue, the CSHL team used a variety of methods. One of these involved delivering a gene that encodes for a light-sensitive protein into the particular neurons Li’s group wanted to look at.

By implanting a very thin fiber-optic cable directly into the area containing the photosensitive neurons, the team was able to shine colored laser light with pinpoint accuracy onto the cells, and in this manner activate them. This is a technique known as optogenetics. Any changes in the behavior of the mice in response to the laser were then monitored.

A subset of neurons in the central amygdala controls fear expression

The ability to probe genetically defined groups of neurons was vital because there are two sets of neurons important in fear-learning and memory processes. The difference between them, the team learned, was in their release of message-carrying neurotransmitters into the spaces called synapses between neurons. In one subset of neurons, neurotransmitter release was enhanced; in another it was diminished. If measurements had been taken across the total cell population in the central amygdala, neurotransmitter levels from these two distinct sets of neurons would have been averaged out, and thus would not have been detected.

Li’s group found that fear conditioning induced experience-dependent changes in the release of neurotransmitters in excitatory synapses that connect with inhibitory neurons — neurons that suppress the activity of other neurons — in the central amygdala. These changes in the strength of neuronal connections are known as synaptic plasticity.

Particularly important in this process, the team discovered, were somatostatin-positive (SOM+) neurons. Somatostatin is a hormone that affects neurotransmitter release. Li and colleagues found that fear-memory formation was impaired when they prevent the activation of SOM+ neurons.

SOM+ neurons are necessary for recall of fear memories, the team also found. Indeed, the activity of these neurons alone proved sufficient to drive fear responses. Thus, instead of being a passive relay for the signals driving fear learning and responses in mice, the team’s work demonstrates that the central amygdala is an active component, and is driven by input from the lateral amygdala, to which it is connected.

“We find that the fear memory in the central amygdala can modify the circuit in a way that translates into action — or what we call the fear response,” explains Li.

In the future Li’s group will try to obtain a better understanding of how these processes may be altered in post-traumatic stress disorder (PTSD) and other disorders involving abnormal fear learning. One important goal is to develop pharmacological interventions for such disorders.

Li says more research is needed, but is hopeful that with the discovery of specific cellular markers and techniques such as optogenetics, a breakthrough can be made.

Journal Reference:

  1. Haohong Li, Mario A Penzo, Hiroki Taniguchi, Charles D Kopec, Z Josh Huang, Bo Li. Experience-dependent modification of a central amygdala fear circuitNature Neuroscience, 2013; DOI: 10.1038/nn.3322

New Research Shows Complexity of Global Warming (Science Daily)

Jan. 30, 2013 — Global warming from greenhouse gases affects rainfall patterns in the world differently than that from solar heating, according to a study by an international team of scientists in the January 31 issue of Nature. Using computer model simulations, the scientists, led by Jian Liu (Chinese Academy of Sciences) and Bin Wang (International Pacific Research Center, University of Hawaii at Manoa), showed that global rainfall has increased less over the present-day warming period than during the Medieval Warm Period, even though temperatures are higher today than they were then.

Clouds over the Pacific Ocean. (Credit: Shang-Ping Xie)

The team examined global precipitation changes over the last millennium and future projection to the end of 21st century, comparing natural changes from solar heating and volcanism with changes from human-made greenhouse gas emissions. Using an atmosphere-ocean coupled climate model that simulates realistically both past and present-day climate conditions, the scientists found that for every degree rise in global temperature, the global rainfall rate since the Industrial Revolution has increased less by about 40% than during past warming phases of Earth.

Why does warming from solar heating and from greenhouse gases have such different effects on global precipitation?

“Our climate model simulations show that this difference results from different sea surface temperature patterns. When warming is due to increased greenhouse gases, the gradient of sea surface temperature (SST) across the tropical Pacific weakens, but when it is due to increased solar radiation, the gradient increases. For the same average global surface temperature increase, the weaker SST gradient produces less rainfall, especially over tropical land,” says co-author Bin Wang, professor of meteorology.

But why does warming from greenhouse gases and from solar heating affect the tropical Pacific SST gradient differently?

“Adding long-wave absorbers, that is heat-trapping greenhouse gases, to the atmosphere decreases the usual temperature difference between the surface and the top of the atmosphere, making the atmosphere more stable,” explains lead-author Jian Liu. “The increased atmospheric stability weakens the trade winds, resulting in stronger warming in the eastern than the western Pacific, thus reducing the usual SST gradient — a situation similar to El Niño.”

Solar radiation, on the other hand, heats Earth’s surface, increasing the usual temperature difference between the surface and the top of the atmosphere without weakening the trade winds. The result is that heating warms the western Pacific, while the eastern Pacific remains cool from the usual ocean upwelling.

“While during past global warming from solar heating the steeper tropical east-west SST pattern has won out, we suggest that with future warming from greenhouse gases, the weaker gradient and smaller increase in yearly rainfall rate will win out,” concludes Wang.

Journal Reference:

  1. Jian Liu, Bin Wang, Mark A. Cane, So-Young Yim, June-Yi Lee. Divergent global precipitation changes induced by natural versus anthropogenic forcingNature, 2013; 493 (7434): 656 DOI: 10.1038/nature11784

Understanding the Historical Probability of Drought (Science Daily)

Jan. 30, 2013 — Droughts can severely limit crop growth, causing yearly losses of around $8 billion in the United States. But it may be possible to minimize those losses if farmers can synchronize the growth of crops with periods of time when drought is less likely to occur. Researchers from Oklahoma State University are working to create a reliable “calendar” of seasonal drought patterns that could help farmers optimize crop production by avoiding days prone to drought.

Historical probabilities of drought, which can point to days on which crop water stress is likely, are often calculated using atmospheric data such as rainfall and temperatures. However, those measurements do not consider the soil properties of individual fields or sites.

“Atmospheric variables do not take into account soil moisture,” explains Tyson Ochsner, lead author of the study. “And soil moisture can provide an important buffer against short-term precipitation deficits.”

In an attempt to more accurately assess drought probabilities, Ochsner and co-authors, Guilherme Torres and Romulo Lollato, used 15 years of soil moisture measurements from eight locations across Oklahoma to calculate soil water deficits and determine the days on which dry conditions would be likely. Results of the study, which began as a student-led class research project, were published online Jan. 29 inAgronomy Journal. The researchers found that soil water deficits more successfully identified periods during which plants were likely to be water stressed than did traditional atmospheric measurements when used as proposed by previous research.

Soil water deficit is defined in the study as the difference between the capacity of the soil to hold water and the actual water content calculated from long-term soil moisture measurements. Researchers then compared that soil water deficit to a threshold at which plants would experience water stress and, therefore, drought conditions. The threshold was determined for each study site since available water, a factor used to calculate threshold, is affected by specific soil characteristics.

“The soil water contents differ across sites and depths depending on the sand, silt, and clay contents,” says Ochsner. “Readily available water is a site- and depth-specific parameter.”

Upon calculating soil water deficits and stress thresholds for the study sites, the research team compared their assessment of drought probability to assessments made using atmospheric data. They found that a previously developed method using atmospheric data often underestimated drought conditions, while soil water deficits measurements more accurately and consistently assessed drought probabilities. Therefore, the researchers suggest that soil water data be used whenever it is available to create a picture of the days on which drought conditions are likely.

If soil measurements are not available, however, the researchers recommend that the calculations used for atmospheric assessments be reconfigured to be more accurate. The authors made two such changes in their study. First, they decreased the threshold at which plants were deemed stressed, thus allowing a smaller deficit to be considered a drought condition. They also increased the number of days over which atmospheric deficits were summed. Those two changes provided estimates that better agreed with soil water deficit probabilities.

Further research is needed, says Ochsner, to optimize atmospheric calculations and provide accurate estimations for those without soil water data. “We are in a time of rapid increase in the availability of soil moisture data, but many users will still have to rely on the atmospheric water deficit method for locations where soil moisture data are insufficient.”

Regardless of the method used, Ochsner and his team hope that their research will help farmers better plan the cultivation of their crops and avoid costly losses to drought conditions.

Journal Reference:

  1. Guilherme M. Torres, Romulo P. Lollato, Tyson E. Ochsner.Comparison of Drought Probability Assessments Based on Atmospheric Water Deficit and Soil Water Deficit.Agronomy Journal, 2013; DOI: 10.2134/agronj2012.0295

U.S. Water Supply Not as Threatened as Believed, Study Finds (Science Daily)

Jan. 30, 2013 — Although reports of drought conditions, water wars and restrictions have often painted a bleak picture of the nation’s water availability, a new University of Florida survey finds that conditions aren’t quite so bad as believed.

Jim Jawitz, a UF soil and water science professor, and Julie Padowski, who earned her doctoral degree from UF and is now a postdoctoral researcher at Stanford University, knew that previous assessments of urban water supplies typically used what is known as a “runoff-based approach,” which takes into account factors such as river flows and rainfall amounts.

Jawitz and Padowski knew that those assessments did not consider the infrastructure used to maintain urban water supplies, such as water stored in aquifers, lakes, reservoirs or water that’s pumped in to an area and stored. So for 225 U.S. metropolitan areas with populations of more than 100,000, that’s what they did, and their findings have been published online by the journal Water Resources Research.

When assessing cities using the runoff-based approach, the UF study found that 47 percent of the total U.S. population is vulnerable to water scarcity issues, however, when infrastructure was accounted for, the number dropped to just 17 percent of the population. Residents in the top 225 metropolitan areas make up the bulk of the U.S. population.

Jawitz, a faculty member with UF’s Institute of Food and Agricultural Sciences, said they expected to find fewer areas vulnerable to water shortages than past studies had because of the different methodology, but some of their findings surprised them.

“We have people who live in the desert and they have water and it’s because of their infrastructure. If you live in a city that has a large of reservoir of water stored and there’s a drought, it doesn’t have the same effect on you as if you live in a city where there’s a drought and you don’t have a large reservoir,” he said.

They didn’t expect Atlanta — where legal battles over water rights with neighboring states initially prompted the researchers to tackle the survey — to fall near the middle among the 225 cities they studied for water access and vulnerability.

Another unusual finding: Miami, with its lush, tropical landscape, landing in the top 10 most vulnerable cities. Jawitz, a South Florida native, said although the Miami area generally enjoys an abundance of rain, it’s not stored anywhere. That means during periods of drought, the area becomes vulnerable.

A website that ranks the 225 largest U.S. urban areas based on water availability and vulnerability can be found at soils.ifas.ufl.edu/hydrology/cities. The list is a combination of results of where each city falls on a 0-to-100 water-accessibility scale as well as a water-vulnerability rating of low, medium or high.

The researchers also had a modern twist to their study. Padowski created a media-text analysis to search online news archives for reports for each city, looking for stories about water restrictions or drought conditions.

They found that the media reports backed up their method of analysis but did not correlate significantly with estimates made using the runoff-based approach.

Padowski said despite the good news about water, she fully expects water conservation should and will be a front-and-center topic for many years to come.

“As population growth increases, we don’t have more resources to tap — we can’t just find another lake or another river to dam,” she said. “It’s going to come down to sharing, conservation and efficiency.”

Rob McDonald, senior scientist for sustainable land use with The Nature Conservancy, said the study adds to what scientists know about urban water use in the U.S. and raises intriguing questions about whether large cities’ infrastructure will be ready for conditions brought on by climate change.

“To me, it shows that infrastructure matters,” he said. “Do cities go out even further for water? If a city is dependent on snow melts from the mountains for its water, what happens if it gets warm enough that there isn’t a snowpack?”

The study was funded by the Florida Agricultural Experiment Station and the Adaptive Management of Water, Wetlands, and Watersheds IGERT program.

Revolução nas universidades (OESP)

JC e-mail 4656, de 30 de Janeiro de 2013.

Artigo de Thomas Friedman* no The New York Times, publicado no O Estado de São Paulo

Avanço do ensino superior online nas melhores escolas tornará o conceito de diploma algo arcaico; e isso é bom
Deus sabe que há muitas más notícias no mundo atual que nos derrubam, mas está ocorrendo alguma coisa formidável que me deixa esperançoso com relação ao futuro. Trata-se da revolução, incipiente, no ensino superior online.

Nada tem mais potencial para tirar as pessoas da pobreza – oferecendo a elas um ensino acessível que vai ajudá-las a conseguir trabalho ou ter melhores condições no seu emprego.
Nada tem mais potencial para libertar um bilhão de cérebros para solucionar os grandes problemas do mundo.

E nada tem mais potencial para recriar o ensino superior do que as MOOC (Massive Open Online Course), plataformas desenvolvidas por especialistas de Stanford, por colegas do MIT (Massachusetts Institute of Technology) e por empresas como Goursera e Udacity.

Em maio, escrevi um artigo sobre a Goursera – fundada por dois cientistas da computação de Stanford, Daphne Koller e Andrew Ng. Há duas semanas, retornei a Paio Alto para saber do seu progresso. Quando visitei a Goursera, em 2012, cerca de 300 mil pessoas participavam de 38 cursos proferidos por professores de Stanford e de outras universidades de elite.

Hoje, são 2,4 milhões de alunos e 214 cursos de 33 universidades, incluindo 8 internacionais. AnantAgarwal, ex-diretor do laboratório de inteligência artificial do MIT, hoje é presidente da edX, uma plataforma sem fins lucrativos criada em conjunto pelo MIT e pela Univer-sidade Harvard. Anant disse que, desde maio, cerca de 155 mil alunos do mundo todo participam do primeiro curso da edX: um curso introdutório sobre circuitos do MIT.

“E um número superior ao total dos alunos do MIT em sua história de 150 anos”, afirmou.
Claro que somente uma pequena porcentagem desses alunos completa o curso, mas estou convencido de que, dentro de cinco anos, essas plataformas alcançarão um público mais amplo. Imagine como isso poderá mudar a ajuda externa dos EUA.

Gastando relativamente pouco, o país poderia arrendar um espaço num vilarejo egípcio, instalar duas dezenas de computadores e dispositivos de acesso à internet de alta velocidade via satélite, contratar um professor local como coordenador e convidar todos os egípcios que desejarem ter aulas online com os melhores professores do mundo e legendas em árabe.

É preciso ouvir as histórias narradas pelos pioneiros dessa iniciativa para compreender seu potencial revolucionário. Uma das favoritas de Daphne Koller é sobre Daniel, um jovem de 17 anos com autismo que se comunica por meio do computador. Ele fez um curso online de poesia moderna oferecido pela Universidade da Pensilvânia.

Segundo Daniel e seus pais, a combinação de um currículo acadêmico rigoroso, que exige que ele se concentre na sua tarefa, e do sistema de aprendizado online, que não força sua capacidade de se relacionar, permite que ele administre melhor o autismo.

Daphne mostrou uma carta de Daniel em que ele escreveu: “Por favor, relateà Goursera e à Universidade da Pensilvânia a minhahistória. Souumjovem saindo do autismo. Ainda não consigo sentar-me numa sala de aula, de modo que esse foi meu primeiro curso de verdade.

Agora, sei que posso me beneficiar de um trabalho que exige muito de mim e ter o prazer de me sintonizar com o mundo.” Um membro da equipe do Goursera, que fez um curso sobre sustentabilida-de, me disse que foi muito mais interessante do que um estudo similar que ele fez na faculdade. Do curso online participaram estudantes do mundo todo e, assim, “as discussões que surgiram foram muito mais valiosas e interessantes do que os debates com pessoas iguais de uma típica faculdade americana. Mitch Duneier, professor de sociologia de Princeton, escreveu um ensaio sobre sua experiência ao dar aula num curso da Coursera.

“Há alguns meses, quando o campus de Princeton ficou quase em silêncio depois das cerimônias de graduação, 40 mil estudantes de 113 países chegaram aqui via internet para um curso grátis de introdução à sociologia. Minha aula de abertura, sobre o clássico de C. Wright Mills, de 1959, The Sociological Imagination, foi concentrada na leitura minuciosa do texto de um capítulo-chave. Pedi aos alunos para seguirem a análise em suas cópias, como faço em sala de aula. Quando dou essa aula em Princeton, normalmente, são feitas algumas perguntas perspicazes. Nesse caso, algumas horas depois de postar a versão online, os fóruns pegaram fogo, com centenas de comentários e perguntas. Alguns dias depois, eram milhares. Num espaço de três semanas, recebi mais feed-back sobre minhas ideias 11a área de sociologia do que em toda a minha carreira de professor, o que influenciou consideravelmente cada uma das minhas aulas e seminários seguintes.”

Anant Agarwal, da edX, fala sobre um estudante no Cairo que teve dificuldades e postou uma mensagem dizendo que pretendia abandonar o curso online. Em resposta, outros alunos no Cairo, da mesma classe, o convidaram para um encontro numa casa de chá, onde se ofereceram para ajudá-lo. Um estudante da Mongólia, de 15 anos, que estava na mesma classe, participando de um curso semipre-sencial, hoje está se candidatando a uma vaga no MIT e na Universidade da Califórnia, em Berkeley.

À medida que pensamos no futuro do ensino superior, segundo o presidente do MIT, Rafael Reif, algo que hoje chamamos “diploma” será um conceito relacionado com “tijolos e argamassa” – e as tradicionais experiências 110 campus, que influenciarão cada vez mais a tecnologia e a internet para melhorar o trabalho em sala de aula e no laboratório.

Ao lado disso, contudo, muitas universidades oferecerão cursos online para estudantes de qualquer parte do mundo, em que eles conseguirão “credenciais” – ou seja, certificados atestando que realizaram o trabalho e passaram, em todos os exames.

O processo de criação de credenciais fidedignas certificando que o aluno domina adequadamente o assunto – e no qual um empregador pode confiar ainda está sendo aperfeiçoado por todos os MOOCs. No entanto, uma vez resolvida a questão, esse fenômeno realmente se propagará muito.

Posso ver o dia em que você criará o seu diploma universitário participando dos melhores cursos online com os mais capacitados professores do mundo todo – de computação de Stanford, de empreendedorismo da Wharton, de ética da Brandeis, de literatura da Universidade de Edimburgo – pagando apenas uma taxa pelo certificado de conclusão do curso. Isso mudará o ensino, o aprendizado e o caminho para o emprego.

“Um novo mundo está se revelando”, disse Reif. “E todos terão de se adaptar”.

* Thomas Friedman é colunista do The New York Times. (O texto foi traduzido por Terezinha Martinho do O Estado de São Paulo)

Make climate change a priority (Washington Post)

Graphic: A new report prepared for the World Bank finds that the planet is on a path to warming 4 degrees by the end of the century, with devastating consequences. Click on the infographic to go to the World Bank for more information.

By Jim Yong Kim, Published: January 24

Jim Yong Kim is president of the World Bank.

The weather in Washington has been like a roller coaster this January. Yes, there has been a deep freeze this week, but it was the sudden warmth earlier in the month that was truly alarming. Flocks of birds — robins, wrens, cardinals and even blue jays – swarmed bushes with berries, eating as much as they could. Runners and bikers wore shorts and T-shirts. People worked in their gardens as if it were spring.

The signs of global warming are becoming more obvious and more frequent. A glut of extreme weather conditions is appearing globally. And the average temperature in the United States last year was the highest ever recorded.

As economic leaders gathered in Davos this week for the World Economic Forum, much of the conversation was about finances. But climate change should also be at the top of our agendas, because global warming imperils all of the development gains we have made.If there is no action soon, the future will become bleak. The World Bank Groupreleased a reportin November that concluded that the world could warm by 7.2 degrees Fahrenheit (4 degrees Celsius) by the end of this century if concerted action is not taken now.

A world that warm means seas would rise 1.5 to 3 feet, putting at risk hundreds of millions of city dwellers globally. It would mean that storms once dubbed “once in a century” would become common, perhaps occurring every year. And it would mean that much of the United States, from Los Angeles to Kansas to the nation’s capital, would feel like an unbearable oven in the summer.

My wife and I have two sons, ages 12 and 3. When they grow old, this could be the world they inherit. That thought alone makes me want to be part of a global movement that acts now.

Even as global climate negotiations continue, there is a need for urgent action outside the conventions. People everywhere must focus on where we will get the most impact to reduce emissions and build resilience in cities, communities and countries.

Strong leadership must come from the six big economies that account for two-thirds of the energy sector’s global carbon dioxide emissions. President Obama’s reference in his inaugural address this week to addressing climate and energy could help reignite this critical conversation domestically and abroad.

The world’s top priority must be to get finance flowing and get prices right on all aspects of energy costs to support low-carbon growth. Achieving a predictable price on carbon that accurately reflects real environmental costs is key to delivering emission reductions at scale. Correct energy pricing can also provide incentives for investments in energy efficiency and cleaner energy technologies.

A second immediate step is to end harmful fuel subsidies globally, which could lead to a 5 percent fall in emissions by 2020. Countries spend more than $500 billion annually in fossil-fuel subsidies and an additional $500 billion in other subsidies, often related to agriculture and water, that are, ultimately, environmentally harmful. That trillion dollars could be put to better use for the jobs of the future, social safety nets or vaccines.

A third focus is on cities. The largest 100 cities that contribute 67 percent of energy-related emissions are both the center of innovation for green growth and the most vulnerable to climate change. We have seen great leadership, for example, in New York and Rio de Janeiro on low-carbon growth and tackling practices that fuel climate change.

At the World Bank Group, through the $7 billion-plus Climate Investment Funds, we are managing forests, spreading solar energy and promoting green expansion for cities, all with a goal of stopping global warming. We also are in the midst of a major reexamination of our own practices and policies.

Just as the Bretton Woods institutions were created to prevent a third world war, the world needs a bold global approach to help avoid the climate catastrophe it faces today. The World Bank Group is ready to work with others to meet this challenge. With every investment we make and every action we take, we should have in mind the threat of an even warmer world and the opportunity of inclusive green growth.

After the hottest year on record in the United States, a year in which Hurricane Sandycaused billions of dollars in damagerecord droughts scorched farmland in the Midwest and our organization reported that the planet could become more than 7 degrees warmer, what are we waiting for? We need to get serious fast. The planet, our home, can’t wait.

Scientists Underestimated Potential for Tohoku Earthquake: Now What? (Science Daily)

Jan. 23, 2013 — The massive Tohoku, Japan, earthquake in 2011 and Sumatra-Andaman superquake in 2004 stunned scientists because neither region was thought to be capable of producing a megathrust earthquake with a magnitude exceeding 8.4.

Seismograph. (Credit: © huebi71 / Fotolia)

Now earthquake scientists are going back to the proverbial drawing board and admitting that existing predictive models looking at maximum earthquake size are no longer valid.

In a new analysis published in the journal Seismological Research Letters, a team of scientists led by Oregon State University’s Chris Goldfinger describes how past global estimates of earthquake potential were constrained by short historical records and even shorter instrumental records. To gain a better appreciation for earthquake potential, he says, scientists need to investigate longer paleoseismic records.

“Once you start examining the paleoseismic and geodetic records, it becomes apparent that there had been the kind of long-term plate deformation required by a giant earthquake such as the one that struck Japan in 2011,” Goldfinger said. “Paleoseismic work has confirmed several likely predecessors to Tohoku, at about 1,000-year intervals.”

The researchers also identified long-term “supercycles” of energy within plate boundary faults, which appear to store this energy like a battery for many thousands of years before yielding a giant earthquake and releasing the pressure. At the same time, smaller earthquakes occur that do not to any great extent dissipate the energy stored within the plates.

The newly published analysis acknowledges that scientists historically may have underestimated the number of regions capable of producing major earthquakes on a scale of Tohoku.

“Since the 1970s, scientists have divided the world into plate boundaries that can generate 9.0 earthquakes versus those that cannot,” said Goldfinger, a professor in OSU’s College of Earth, Ocean, and Atmospheric Sciences. “Those models were already being called into question when Sumatra drove one stake through their heart, and Tohoku drove the second one.

“Now we have no models that work,” he added, “and we may not have for decades. We have to assume, however, that the potential for 9.0 subduction zone earthquakes is much more widespread than originally thought.”

Both Tohoku and Sumatra were written off in the textbooks as not having the potential for a major earthquake, Goldfinger pointed out.

“Their plate age was too old, and they didn’t have a really large earthquake in their recent history,” Goldfinger said. “In fact, if you look at a northern Japan seismic risk map from several years ago, it looks quite benign — but this was an artifact of recent statistics.”

Paleoseismic evidence of subduction zone earthquakes is not yet plentiful in most cases, so little is known about the long-term earthquake potential of most major faults. Scientists can determine whether a fault has ruptured in the past — when and to what extent — but they cannot easily estimate how big a specific earthquake might have been. Most, Goldfinger says, fall into ranges — say, 8.4 to 8.7.

Nevertheless, that type of evidence can be more telling than historical records because it may take many thousands of years to capture the full range of earthquake behavior.

In their analysis, the researchers point to several subduction zone areas that previously had been discounted as potential 9.0 earthquake producers — but may be due for reconsideration. These include central Chile, Peru, New Zealand, the Kuriles fault between Japan and Russia, the western Aleutian Islands, the Philippines, Java, the Antilles Islands and Makran, Pakistan/Iran.

Onshore faults such as the Himalayan Front may also be hiding outsized earthquakes, the researchers add. Their work was supported by the National Science Foundation.

Goldfinger, who directs the Active Tectonics and Seafloor Mapping Laboratory at Oregon State, is a leading expert on the Cascadia Subduction Zone off the Pacific Northwest coast of North America. His comparative studies have taken him to the Indian Ocean, Japan and Chile, and in 2007, he led the first American research ship into Sumatra waters in nearly 30 years to study similarities between the Indian Ocean subduction zone and Cascadia.

Paleoseismic evidence abounds in the Cascadia Subduction Zone, Goldfinger pointed out. When a major offshore earthquake occurs, the disturbance causes mud and sand to begin streaming down the continental margins and into the undersea canyons. Coarse sediments called turbidites run out onto the abyssal plain; these sediments stand out distinctly from the fine particulate matter that accumulates on a regular basis between major tectonic events.

By dating the fine particles through carbon-14 analysis and other methods, Goldfinger and colleagues can estimate with a great deal of accuracy when major earthquakes have occurred. Over the past 10,000 years, there have been 19 earthquakes that extended along most of the Cascadia Subduction Zone margin, stretching from southern Vancouver Island to the Oregon-California border.

“These would typically be of a magnitude from about 8.7 to 9.2 — really huge earthquakes,” Goldfinger said. “We’ve also determined that there have been 22 additional earthquakes that involved just the southern end of the fault. We are assuming that these are slightly smaller — more like 8.0 — but not necessarily. They were still very large earthquakes that if they happened today could have a devastating impact.”

Other researchers on the analysis include Yasutaka Ikeda of University of Tokyo, Robert S. Yeats of Oregon State University, and Junjie Ren, of the Chinese Seismological Bureau.

Journal Reference:

  1. C. Goldfinger, Y. Ikeda, R. S. Yeats, J. Ren. Superquakes and SupercyclesSeismological Research Letters, 2013; 84 (1): 24 DOI: 10.1785/0220110135

The Storm That Never Was: Why Meteorologists Are Often Wrong (Science Daily)

Jan. 24, 2013 — Have you ever woken up to a sunny forecast only to get soaked on your way to the office? On days like that it’s easy to blame the weatherman.

BYU engineering professor Julie Crockett studies waves in the ocean and the atmosphere. (Credit: Image courtesy of Brigham Young University)

But BYU mechanical engineering professor Julie Crockett doesn’t get mad at meteorologists. She understands something that very few people know: it’s not the weatherman’s fault he’s wrong so often.

According to Crockett, forecasters make mistakes because the models they use for predicting weather can’t accurately track highly influential elements called internal waves.

Atmospheric internal waves are waves that propagate between layers of low-density and high-density air. Although hard to describe, almost everyone has seen or felt these waves. Cloud patterns made up of repeating lines are the result of internal waves, and airplane turbulence happens when internal waves run into each other and break.

“Internal waves are difficult to capture and quantify as they propagate, deposit energy and move energy around,” Crockett said. “When forecasters don’t account for them on a small scale, then the large scale picture becomes a little bit off, and sometimes being just a bit off is enough to be completely wrong about the weather.”

One such example may have happened in 2011, when Utah meteorologists predicted an enormous winter storm prior to Thanksgiving. Schools across the state cancelled classes and sent people home early to avoid the storm. Though it’s impossible to say for sure, internal waves may have been driving stronger circulations, breaking up the storm and causing it to never materialize.

“When internal waves deposit their energy it can force the wind faster or slow the wind down such that it can enhance large scale weather patterns or extreme kinds of events,” Crockett said. “We are trying to get a better feel for where that wave energy is going.”

Internal waves also exist in oceans between layers of low-density and high-density water. These waves, often visible from space, affect the general circulation of the ocean and phenomena like the Gulf Stream and Jet Stream.

Both oceanic and atmospheric internal waves carry a significant amount of energy that can alter climates.

Crockett’s latest wave research, which appears in a recent issue of the International Journal of Geophysics, details how the relationship between large-scale and small-scale internal waves influences the altitude where wave energy is ultimately deposited.

To track wave energy, Crockett and her students generate waves in a tank in her lab and study every aspect of their behavior. She and her colleagues are trying to pinpoint exactly how climate changes affect waves and how those waves then affect weather.

Based on this, Crockett can then develop a better linear wave model with both 3D and 2D modeling that will allow forecasters to improve their weather forecasting.

“Understanding how waves move energy around is very important to large scale climate events,” Crockett said. “Our research is very important to this problem, but it hasn’t solved it completely.”

Journal Reference:

  1. B. Casaday, J. Crockett. Investigation of High-Frequency Internal Wave Interactions with an Enveloped Inertia WaveInternational Journal of Geophysics, 2012; 2012: 1 DOI: 10.1155/2012/863792

Which Way Did the Taliban Go? (New York Times)

Joël van Houdt for The New York Times. Colonel Daowood, left, considered his next move on the Chak Valley road.

By LUKE MOGELSON

Published: January 17, 2013 96 Comments

The village was abandoned. Streets deserted. Houses empty. Behind the central mosque rose a steep escarpment. Behind the escarpment mountains upon mountains. Up there — above the timberline, among the peaks — a white Taliban flag whipped in the wind. Several Afghan soldiers were admiring it when a stunted and contorted person emerged from an alley. Dressed in rags, he waved a hennaed fist at them and wailed. Tears streamed down his face. Most of the soldiers ignored him. Some laughed uncomfortably. A few jabbed their rifles at his chest and simulated shooting. The man carried on undeterred — reproaching them in strange tongues.

A truck pulled up, and Lt. Col. Mohammad Daowood, the battalion commander, stepped out. Everyone waited to see what he would do. Daowood is a man alive to his environment and adept at adjusting his behavior by severe or subtle degrees. He can transform, instantaneously, from empathetic ally to vicious disciplinarian. To be with him is to be in constant suspense over the direction of his mood. At the same time, there is a calculation to his temper. You feel it is always deliberately, never capriciously, employed. This only adds to his authority and makes it impossible to imagine him in a situation of which he is not the master. A flicker of recognition in the deranged man’s eyes suggested that he intuited this. He approached Daowood almost bashfully; only as he closed within striking range did he seem to regain his lunatic energy, emitting a low, threatening moan. We waited for Daowood to hit him. Instead, Daowood began to clap and sing. Instantly, the man’s face reorganized itself. Tearful indignation became pure, childish joy. He started to dance.

This continued for a surprisingly long time. The commander clapping and singing. The deranged man lost in a kind of ecstatic, whirling performance, waving his prayer cap in the air, stamping his feet. When at last Daowood stopped, the man was his. He stood there — breathless and obsequious — waiting for what came next. Daowood mimed the motion of wrapping a turban on his head. Where are the Taliban? Eager to please, the man beamed and pointed across the valley.

Several hours later, as I shared the bed of a pickup truck with an Afghan soldier who manned a machine gun mounted on the roof of the cab, it became evident that we were lost. The rest of the company was nowhere to be seen, though we could hear them, not far off, exchanging rocket and automatic-weapons fire with insurgents who had fled into the mountains and were hiding behind protective crags, shooting down. The driver sped up one narrow rutted path after another. The paths were hemmed in by rock walls — a labyrinth of cul-de-sacs — and the driver grew more panicked and reckless with each dead end. Aside from the occasional night raid, no Afghan or American forces had been to this place in more than a decade. Men stood on top of the walls, watching.

“Where are we going?” I asked the machine-gunner.

He offered the words I had heard time and again — so often, and so predictably, they could be the battalion motto. The words were invoked in response to such questions as: What is the plan? Who is shooting? Where will we sleep tonight? How many dead?

The words are “Mulam nes” — “It isn’t clear.”

Finally the driver stopped and asked a bearded man in a black turban for directions. The man — a Talib? — kindly pointed the way.

Soon we arrived on a bare ridge and found Colonel Daowood almost alone. Two young soldiers stood nearby with rifles. Daowood sat on a rock. A teenage boy knelt before him, kowtowing, wrists cuffed behind his back. Daowood was doing something to his head. As we got closer, we saw that he held scissors and was roughly shearing the boy’s hair. A neat pile of long black locks lay on the ground between Daowood’s feet.

When Daowood noticed us, he smiled and winked. Then he went back to work, screaming in the boy’s ear, “Now do you like being a Talib?”

“No,” the boy whimpered.

“What?”

“No, no, no.”

Daowood lifted him to his feet and examined with satisfaction the ugly patchwork of uneven tufts and bald scalp. He removed the boy’s handcuffs and said, “Go.”

The boy ran away, forgetting his shoes.

While Daowood was giving the haircut, our driver, who it turned out was a company commander, yelled at a pair of intrepid young soldiers who had taken it upon themselves to scale the mountain and capture the Taliban’s flag. We were leaving soon, and the commander wanted them to come back down. The young soldiers, however, were too high. They couldn’t hear him. The commander yelled and yelled. If only they had radios. If only he had a radio. In lieu of one, the commander drew his sidearm, aimed in the general vicinity of the soldiers, then shot two bullets.

The soldiers ducked, peered down. The commander waved.

It was the third day of a four-day operation being conducted by the Afghan National Army (A.N.A.) in Chak District, Wardak Province. There were no U.S. forces in sight. Every so often, a pair of American attack helicopters circled overhead; otherwise, the Afghans — roughly 400 of them — were on their own. For the A.N.A. — which every day assumes a greater share of responsibility for the security of Afghanistan — the operation was an ambitious undertaking and a test of its ability to function independently. For years now, the U.S. military’s priority in Afghanistan has been shifting from effectively prosecuting the present war to preparing Afghans for a future one in which our role is minimal. But even as American troops return home and American bases across the country close, such a future continues to feel difficult to envision. How will the A.N.A. fare when it is truly on its own? Predictions vary, tending toward the pessimistic. To the extent that assessments of the competency and preparedness of the A.N.A. take into consideration on-the-ground observations, however, they are usually limited to the perspective of American forces working in concert with Afghan units.

After a week with Daowood’s battalion, what I found is that the A.N.A. looks very different when there are no Americans around.

So does the war.

The operation to Chak District was nearly over before it began. Just hours before departure, during a briefing at Combat Outpost Dash-e Towp, the battalion headquarters, Daowood told his subordinate officers: “The only thing we’re waiting on is the fuel. If we don’t receive the fuel, we will not be able to do the operation.” A cohort of American advisers stood in the back of the room, silently listening. In the past, they probably would have offered to provide the fuel themselves. But that paradigm has changed. Increasingly, A.N.A. units must rely on their own supply lines, however inefficient they may be. Nevertheless, as the officers rose from their chairs, an Afghan captain pulled aside one of the advisers and told him the battalion lacked batteries for the metal detectors used to find improvised explosive devices. The adviser sighed. “Come over to our side,” he said, “and we’ll see what we can do.”

The American side of Dash-e Towp is separated from the Afghan side by a tall wall and a door that can be opened only with a code to which the Afghans do not have access. Whereas a close partnership between coalition and Afghan forces was for years considered a cornerstone of the overall military strategy (shohna ba shohna — shoulder to shoulder — went the ubiquitous NATO slogan), recently the Americans have distanced and even sequestered themselves from their erstwhile comrades. The about-face is a response to a rash of insider or “green on blue” attacks that killed more than 60 foreign troops in 2012 (and wounded 94), accounting for 22 percent of all coalition combat deaths. The Americans claim that many of the killings result from cultural differences; the Taliban claim to have infiltrated the security forces; the Afghan government claims “foreign spy agencies” are to blame. Whatever their provenance, the attacks have eroded trust to such a degree that NATO has begun designating some personnel as “guardian angels.” It is the guardian angel’s job to protect the NATO soldier from the Afghan soldier whom it is the NATO soldier’s job to train.

Other concerns abound. When the time comes, for instance, will Afghanistan’s army be able to maintain its own equipment and facilities? Evacuate and treat its own casualties? Overcome ethnic divisions within its ranks? Furnish its units with essential rations like food and fuel? Retain sufficient numbers despite alarmingly high attrition rates? Implement a uniform training doctrine despite alarmingly low literacy rates? Today, according to the Pentagon, exactly one Afghan brigade is capable of operating without any help from the coalition. For better or worse, come Dec. 31, 2014, the other 22 will likely have to do the same.

In anticipation of this reality, the A.N.A. has begun a countrywide realignment of troops that is transforming the battlefield. “Look at the situation,” Gen. Sher Mohamad Karimi, the chief of army staff, told me recently in Kabul. “One hundred and forty thousand international troops, with all the power that they have — the aircraft, the artillery, the tanks, the support — all of that now is going. You cannot expect the Afghan Army to do exactly what the international troops were doing.” As coalition forces diminish, that is, the A.N.A. must decide not only how to fill the gaps but also which gaps to forgo filling. For years, to secure roads and rural areas, Afghan soldiers have manned hundreds of check posts throughout the provinces. Now the A.N.A. plans to relinquish almost all of these in favor of consolidating its forces in significantly fewer locations. General Karimi claims there are two reasons for doing this. First: the Afghans simply lack the wherewithal to keep the more remote posts adequately provisioned. Second: the A.N.A. must move away from defending static positions, toward executing offensive operations. Theoretically, the police will take over check posts as the army quits them. But this will not always be the case; it may seldom be the case. And when vacated posts are not assumed by the police — as has happened in Wardak — it will be hard not to see the ongoing “realignment of troops” as anything other than an old-fashioned retreat.

Chak was one of the first districts in Afghanistan to undergo this change. When Daowood’s battalion woke around 3 a.m. and headed out from Dash-e Towp, the convoy included several large flatbed trailers hauling backhoes and bulldozers that would be used to destroy five of the six A.N.A. check posts in the area. (The last time abandoned posts were left standing in Wardak Province, the Taliban moved into them.) The sun was just starting to rise when the battalion arrived at the first one: a compact fortress of gravel-filled Hesco barriers perched on a squat hill that overlooked the entrance to the district. It was easy to see, from here, why the Taliban liked Chak. Parallel ranges form a wide valley with a river snaking down its middle. Apple orchards and trees with white trunks and bright yellow leaves crowd the basin. Dark canyons branch into the mountains. A single road follows the river deeper into the valley, connecting the lawless foothills of the Hindu Kush to Highway 1, a critical transit route that bridges Kabul and Kandahar, northern and southern Afghanistan.

After being reconstructed by an American firm at an estimated cost of $300 million, Highway 1 was extolled by the U.S. ambassador, in 2005, as “a symbol of Afghan renewal and progress.” Since then it has become one of the most dangerous roads on earth, scarred by bomb blasts, the site of frequent ambushes and executions by insurgent marauders, strewed with the charred carcasses of fuel tankers set alight on their way to NATO bases. As Daowood looked out from the top of the hill, he explained that Chak was an ideal staging ground for attacks on the highway and that the check posts were the only way to protect it. “When we had these check posts, there was good security,” Daowood said. “The people were happy. Of course, when we leave them, the Taliban will come back. As soon as we’re gone, they will own this whole area.”

Already, Daowood said, the road following the river was known to accommodate large quantities of remotely detonated bombs. As the colonel ordered the convoy to start forward, I watched two minesweepers testing out their metal detectors. The devices looked antique: Vietnam-era green with thick black wires connected to bulky plastic headphones. It was the sort of technology that made you remember ham radios, and I confess I was skeptical of their ability to clear the way. But after only a half-mile or so, one of the minesweepers stopped. A skinny, bearded soldier jumped out of a Humvee wielding a pickax. The minesweeper pointed at a spot. The soldier with the pickax attacked it. Soon he called to Daowood: “Found it!”

When C-4 explosive was packed around the bomb and exploded from what was deemed a safe remove, the blast proved much larger than anyone expected. Dirt rained down on those of us who were crouched behind a tree 100 meters away. The crater rendered the road impassable, obliging the Afghans to spend the next half-hour filling it with stones. By the time we started moving again, the minesweepers had begun working on another bomb just around the bend. I found the skinny, bearded soldier standing to the side with his pickax lightly balanced on his shoulder, smoking an immense joint.

His name was Shafiullah. He wore a pair of blue latex medical gloves and a metal helmet several sizes too big that sat low and loose over wide, wild eyes: preternaturally alert eyes bugging from their sockets as if to get a little closer to whatever they were looking at. “Did you see that last one?” Shafiullah wanted to know.

“It was big.”

He nodded rapidly, the helmet bucking forward and backward on his head, now threatening to fly off, now jerked into place by its leather chinstrap.

“Very big! Very nice!” He took another toke, held the doobie upright and became suddenly, deeply engrossed in its glowing tip.

“What are the gloves for?” I asked.

“The human body carries an electrical charge. When you work on the bombs, if you’re not careful, you can ignite them with the electricity in your fingers.”

“Do you always smoke hash before you work on the bombs?”

More vigorous nodding. “It takes away the fear.”

Shafiullah told me he joined the army about five years ago, when he turned 18. He served for three years as a regular infantry soldier in the violent Pakistani border regions before volunteering to become an explosive-ordnance-disposal technician. “I always wanted to be one,” he said. “I love when someone calls me an engineer.” About a year ago, after graduating from a six-month training program taught by French and American soldiers, Shafiullah was deployed to Wardak. Since then, he estimated, he had disposed of roughly 50 bombs. “Thanks to God I’ve never been hurt,” he said.

I asked if any of the other engineers were less fortunate. Shafiullah said that he belonged to a team of 20 technicians and that during the past three months two were killed and eight badly injured. He also said that nine of his friends from the training course were now dead or maimed. Back on the road, one of the minesweepers called for the pickax. Shafiullah took a last drag before joining them. A few minutes later, the valley echoed with a tremendous boom.

The shooting started soon after: rifles, machine guns, rocket-propelled grenades. It was too far ahead to see exactly what was happening. Later I learned that a group of insurgents ambushed the lead element in the convoy, strafing a narrow stretch in the road from within a dense stand of trees. The soldiers responded forcefully — with more and bigger weapons — killing six people in the village where the attack originated. A little while later, not far from the first shootout, there was another. This time an Afghan soldier fired a rocket-propelled grenade at a group of gunmen, killing seven. According to the soldiers, all the dead were Taliban.

By the time I reached the site with Colonel Daowood, the convoy had already moved on, resuming its lurching penetration of the valley. Perhaps not coincidentally, the ambushes occurred near a small gas station that was the target of an American airstrike the night before. The owner of the gas station — a Taliban leader named Gulam Ali, who Daowood said commanded several hundred insurgents in Chak — was killed by a missile. Two old fuel pumps still stood out front, but the row of shops behind them was ruined: windows shattered, charred metal bars curled back like the melted tines of a plastic fork. Each shop offered its own little diorama of destruction. Hundreds of pill bottles scattered on a pharmacy floor; emptied shelves hanging vertically in a general store; an iron and a sewing machine standing improbably upright on a tailor’s wooden table, among burned and tattered rolls of cloth.

Next to the gas station was Gulam Ali’s home and headquarters: an immaculate compound centered on a courtyard with rosebushes and a deep freshwater well. An exterior staircase ascended to the bedroom. Inside I was surprised to find the walls pasted with posters illustrating idyllic scenes from some future civilization, in which sleek modern buildings were harmoniously incorporated into rugged natural landscapes. Or maybe it was Switzerland — hard to say. Either way, it was odd to imagine Gulam Ali privately meditating on them. Nor did the inspirational quotes at the top of each poster lessen the oddness. “We love life,” one italicized blurb instructed, “not because we are used to living, but because we are used to loving.” And, “Even if you are on the right track, you’ll get run over if you just sit there.”

When I returned to the courtyard, Daowood announced that he was going to the village where the 13 insurgents had just been killed. “It’s Gulam Ali’s village,” he explained. “I want to pay my respects.” He headed into the trees with no protection other than the two teenage bodyguards who accompanied him everywhere. He wore no helmet or body armor (“I don’t like them; they give me a headache”), and he carried no weapon. Instead he walked with his hands clasped behind his back, casually flipping a string of turquoise prayer beads. When we reached the compound that belonged to Gulam Ali’s parents, where his relatives had gathered to mourn, Daowood told me to wait outside — the presence of a foreigner would offend the family. When he emerged several minutes later, I was happy to be leaving the place. But as we made our way back to the main road, we encountered dozens of men congregated on a low knoll among the plain stone markers and colored flags of the village graveyard. It was a funeral for the Taliban, and the men regarded us with something less than brotherly affection. Daowood said, “Keep walking.” Then he addressed the funeral. “The aircraft are coming back tonight!” he shouted. “The American Special Forces are coming! Leave this area! Don’t stay here! If you stay, you might get killed!”

Immediately, the ceremony began to scatter, the men fleeing down the slope as swiftly as they could without betraying panic. “The helicopters are coming!” Daowood went on. “The Special Forces will be here soon!”

At the time, the colonel’s prompt dissolution of what appeared to be a potentially dangerous situation seemed to me as deft and inspired as his handling of the deranged man would a couple of days later. But something else was going on as well. Expressing his condolences to Gulam Ali’s family, warning the people about a possible airstrike and night raid — it was all part of Daowood’s game. The more time I spent with him, the clearer it became that Daowood was practicing his own version of counterinsurgency, one that involved endearing himself to locals by characterizing as common enemies not only the Taliban but also the Americans and the Afghan government. In almost every village we visited, I watched Daowood rail against Kabul’s political elite to rapt audiences of disgruntled farmers. Once, in a place known to abet insurgents, the colonel told a crowd: “All the high-ranking officials in the government are thieves. They don’t care about the country, the people. They take money from the foreigners and put it in their pockets. They make themselves fat. They go abroad, sleep in big houses, buy expensive cars and never think about the people. They have done nothing for this country.”

As with Daowood’s occasional flights of rage, it was tough to tell just how much of this was theater and how much true belief. My sense was that Daowood was genuinely conflicted: a committed soldier who spent 10 years of his life in the service of a government he was profoundly disenchanted with. And he wasn’t alone. Most soldiers I spoke to conspicuously avoided expressing any fondness for — much less allegiance to — their government. Of course, this is the same with other soldiers in other armies (imagine a U.S. Marine explaining his compulsion to enlist by citing a feeling of fidelity to the Bush or Obama administrations), but the nascency of the Islamic Republic of Afghanistan makes its political leadership and national character uniquely synonymous. Put another way, in a government that has had only one president, you can’t distinguish between corrupt individuals and a broken system. All of which raises the question: In such a country, how can you be both a detractor and a patriot, as Daowood and some of his men seemed clearly to be? The Marine ostensibly fights on behalf of American principles and institutions that transcend elected officials; on behalf of what did the colonel and these soldiers fight? Most of them, when I asked, answered with the word “watan,” or “homeland.” But what does the notion of a homeland mean for someone who has seen his ruled by monarchists, dictators, communists, mujahedeen, Islamic fundamentalists and Karzai?

When it grew dark, we occupied a half-built mud house on the outskirts of a small mountain village, and Colonel Daowood told us his story. The owner of the property had killed a chicken and prepared for us a large pot of soup. Daowood and his entourage huddled around the iridescent mantles of a kerosene lamp, passing the ladle around, hugging their wool field blankets against a near-freezing night.

Daowood’s military career began three decades ago, when he fought the Russians in the tall mountains and narrow valleys of his native Paghman District. After the Soviet-backed government collapsed in 1992, rival mujahedeen groups turned viciously upon one another. While Kabul became the epicenter of a ferocious civil war, Paghman, just 20 minutes west of the city, remained relatively peaceful. Daowood stayed home, preferring not to enter a fray that was decimating the capital and its residents, with no end in sight. But in 1996, when the Taliban entered Kabul and ejected with unexpected ease each of its warring factions, Daowood took his wife and children to Panjshir Valley, an anti-Taliban stronghold where the warlord Ahmed Shah Massoud had retreated in preparation for a longer, harder fight. Although Massoud and his men were Tajiks and Daowood was a Pashtun (the ethnicity of the Taliban) — and although the recent civil war inflamed ethnic animosities — Daowood was received with open arms. Massoud gave his family a house and put Daowood in charge of 100 men.

More war followed for Daowood. Years of land mines and rockets, ambushes and close calls. Years of night operations in the orchards of the vast Shomali Plain — a verdant land between Panjshir and Kabul. Years, finally, of much spilled blood but little ground lost or gained. And then came the year everything changed. When Daowood talks about that time — after he and his comrades routed the Taliban with the help of American air power and special operators — he grins the way you might at a memory of your naïver self. It’s the optimism of those days that both embarrasses and saddens him, the feeling that Afghanistan had been born anew.

Daowood was among the tens of thousands of fighters in the so-called Northern Alliance — a loose confederation of anti-Taliban militias loyal to Massoud and other commanders. Although Massoud himself was assassinated two days before 9/11, his successor, Mohammed Qasim Fahim, supposedly a drug trafficker, was installed as the defense minister for Hamid Karzai’s interim government. Under Fahim, a majority of the Northern Alliance, including Daowood and his 100 men, became the first incarnation of the new Afghan military. While the United States remained committed to the “light footprint” approach championed by Bush and Rumsfeld — eschewing any commitment of resources that might be construed as “nation-building” — Fahim presided over the creation of a force that soon came to resemble the factionalism of the past far more than the nationalism of a future so eagerly anticipated by people like Daowood. As the International Crisis Group put it: “Units became organs of patronage, rewarding allies and supporters with officer commissions. The result was a weak chain of command over a mix of militias plagued by high desertion rates and low operational capacity.”

Whatever power-jockeying and cronyism afflicted the fledgling military, the civilian government under President Karzai was looking even worse. After two years, weary and bitter, Daowood resigned. “It was the corruption,” he explained. “It ruined everything. Everything was destroyed.” While Daowood embraced a new life back in Paghman — managing his family’s land and enjoying the company of his wife and sons — a resurgent Taliban began to exploit a growing disillusionment with the government and a meager deployment of security forces outside the capital. By 2006, there was no denying it: The insurgency had evolved from a lingering nuisance to a legitimate threat.

One day, an old friend from Panjshir, who was serving as a corps commander in the A.N.A., visited Daowood at his farm in Paghman. “We argued a lot,” Daowood recalled. “I didn’t want to be in the army anymore. I didn’t want to fight for this government. When I explained this to him, my friend told me: ‘If good men don’t participate, the criminals will take over. We have to reclaim this country from them.’ ” In the end, Daowood was convinced. Once more he left Paghman. Once more he took up arms.

When Daowood finished his story, I asked whether he really believed that the system was reformable. He thought for a while. Finally, he offered another reason for fighting — one that rang somewhat truer. “The government only steals money,” he told me. “At least they aren’t against education or women or human rights or rule of law.”

The next morning, some soldiers found a Taliban flag and brought it to Daowood. It wasn’t much: Arabic script scrawled in blue ballpoint pen on a square of white bedsheet tied with twine to a stick. Daowood slashed it with his knife and tried setting it on fire. The cloth was slow to catch. While the soldiers fussed with cardboard and kindling, Daowood received a call from the American advisers at Dash-e Towp. They wanted to remind him to begin tearing down the check posts. Daowood was incredulous; he still couldn’t believe it. “What nonsense is this?” he said when he hung up. “Do they want to hand Afghanistan to the Taliban?” The other soldiers looked just as galled. They sullenly watched the flag absorb a green lick of flame, shrivel and burn. “After these check posts are destroyed, we won’t be able to enter this valley,” Daowood said.

All the Afghans in Wardak, it seemed, shared Daowood’s contempt for the decision to close the check posts. When I met with Wardak’s provincial governor, Abdul Majid Khogyani, in Kabul, he told me: “I was a strong opponent of this idea. The police commander of Wardak and the National Directorate of Security chief were also against it. We know this will not work. The result of this strategy is that the Taliban have become stronger. Without the check posts, the Taliban will easily penetrate these areas. And once that happens, it is very difficult to clear them out again.” Majid was convinced that the realignment of troops had been forced on the A.N.A. command by NATO — a suspicion held by many Afghan officers I spoke to. “The local population are asking why NATO would deliberately provide the Taliban with such an opportunity,” the governor said. NATO has declined to comment on its involvement.

In Chak Valley, only one A.N.A. position would remain — the most distant outpost from the highway, manned by a contingent of roughly 100. That afternoon, when the convoy reached this last outpost, a fresh company relieved the bedraggled-looking men who had been stationed there for the past 12 months, collaborating with a U.S. Special Forces team, struggling to gain a foothold. Every one of them painted a similarly bleak picture of near-daily fighting against a more numerous guerrilla army. Mile after mile of mountains and forest was owned wholly by the insurgents. Out in that big wilderness, there was even a Taliban weapons bazaar, where insurgent fighters bought and sold Kalashnikovs and rockets and machine guns and grenades.

The question hovered like a bad smell: How would the Afghan soldiers who remained deep in Chak survive (or perhaps more accurately: What would they be able to accomplish beyond merely surviving?) once every check post between them and Highway 1 was razed? Severing entirely their already embattled position from the foot of the valley would be simple enough. After all, there was only one way in and out. As if to highlight this uncomfortable fact, a local informant called Daowood as soon as the convoy started to make its way back in the direction from which it had come. A number of bombs, the informant warned, were buried somewhere up ahead.

Shafiullah and his team headed to the front, and the procession of Humvees and trucks slowed to a crawl. Right away, the engineers found a copper wire attached to a massive I.E.D. buried two feet underground. A few minutes later, they found another. And then another. As soon as Shafiullah blew up the third bomb, Colonel Daowood’s informant called back to say that there were probably “many more,” though he was uncertain where. By now it was dark, and we still had miles to travel before reaching the relative security of an open area nearer the highway, where the battalion was supposed to bed down. Fifty feet or so ahead of the lead vehicle Shafiullah knelt in the dim beams of the headlights scratching at the dirt with his pickax. After a while there was some hollering and a disorderly hustle toward the rear. The explosion that followed was so powerful that bits of earth lashed our backs in a warm wave.

No one was hurt, and the convoy started forward again. Then it stopped again. While Shafiullah went back to work, I joined a group of soldiers sitting on the remains of an old Soviet tank. Someone produced a joint. The mood was jolly. It turned out the soldiers belonged to the company stationed since last winter at the remotest outpost in Chak. They were glad to be rotating out — even if it meant swapping one deadly place for another. Most of them were Pashtuns from eastern Afghanistan who served for many years and had wives and children to whom they sent their salaries and saw once every several months. The soldiers hoped to get some leave when they returned to Dash-e Towp — but visiting home, they said, was a mission in itself. Stretches of the highway between Dash-e Towp and Kabul were treacherous; many soldiers had been abducted and murdered by insurgents on their way to see their families. In the past you could dress in the traditionalshalwar kameez, hire a taxi and pose as a civilian. But now the Taliban had spies who alerted them when soldiers headed out. The only option was to catch a ride on a convoy, and those could be rare. Recently, the soldiers said, one of their lieutenants lost his infant son to an illness: though he was from Kapisa Province — a short drive north by car — it took him 20 days to get back.

Eventually Shafiullah found and detonated the fourth bomb, and the soldiers on the tank — high as kites by then — returned to the road and continued on. It was 1 in the morning by the time they reached their destination. On the way, they had to stop again and again for Shafiullah’s team to excavate and blow up I.E.D.’s — 11 in total. At some point after midnight the engineers got sloppy, igniting the C-4 on one bomb before Shafiullah could escape the blast radius. The pressure wave collapsed a mud-brick wall he was walking by, crushing his ankle. When I saw Shafiullah the next morning, his pant leg was in tatters and he was limping. His leg looked badly swollen. He hadn’t seen a medic yet and didn’t plan to.

The ground froze solid during the night and Shafiullah — who like most of the men in the battalion was never issued a sleeping bag — got no more than a cold hour’s rest. Nevertheless, while he waited in line to collect his breakfast (a plastic bag containing a hard piece of bread and a boiled egg and a mini-carton of coffee creamer), he seemed in high spirits. “I told you I’d never been hurt before, and now I’m hurt,” Shafiullah said with a laugh. “I was close! But God saved me.”

This was the day that Daowood brought his men up the mountain to a village called Ali Shah and found it deserted except for the deranged man who danced for him. Among the Afghan soldiers, Ali Shah was infamous — an insurgent sanctuary where no government forces had dared to venture in more than a decade. (“Even the women are Taliban!” one sergeant told me.) Daowood had received intelligence that there would be a wedding in the village that day with several insurgent commanders in attendance. He said he wanted to pace the operation to crash the wedding in time for lunch.

When Daowood asked where the Taliban went, the deranged man pointed to a distant hillside where a large group of villagers had gathered outside a mosque. Daowood and his men jumped in their trucks and headed that way. I rode in the back of a Toyota pickup with a middle-aged machine-gunner named Fazil. It turned out that Fazil was the lieutenant the soldiers on the tank had mentioned the night before — the one who had been unable to get home in time for his son’s burial. As we talked, there was something deeply familiar about the way Fazil described his village in Kapisa Province. He might have been a U.S. Marine reminiscing about the family ranch in Texas. The river was wide and clear, bountiful with fish. The people were kind; the air was fresh; the fruit was sweet.

Fazil’s education in the peculiarities of war began when he was 12, during the jihad. One day, while he was with his father and uncle at the local bazaar, a foot patrol of Russian commandos — or Russian soldiers who Fazil assumed were commandos because of the ski masks they were wearing — opened fire on the villagers. Fazil’s uncle bled out and died on the ground in front of him; Fazil’s father also took a bullet but survived. Several years later, a jet from the Soviet-backed government launched a missile at Fazil’s home that killed both of his parents; shortly thereafter, Fazil joined the mujahedeen in Panjshir led by Massoud. During a battle with Soviet fighters, Fazil was shot in the leg and had to be taken to a hospital in Kabul. There the government asked him to switch sides. Fazil agreed and for a year fought for the national army against his former comrades. When I asked how he could volunteer for the same force that killed his parents, Fazil said: “The mujahedeen knew I was with the government the whole time. I was giving them information.” After the government collapsed, Fazil went back to Panjshir and rejoined with Massoud.

This capacity for switching sides, betraying sides, playing sides, often simultaneously, always baffled the foreign forces in Afghanistan. The complex logic of Afghanistan’s ever-shifting allegiances is simply inscrutable to most outsiders; we have never really understood whom we’re fighting or why they’re fighting us. I once went on a mission in a volatile eastern province with a platoon of American soldiers and a member of the U.S. Army’s Human Terrain System — a historian with a doctorate and an assault rifle whose job it was to map which anti-Soviet mujahedeen groups the elders in the area identified with. Some Afghan troops were there as well, and I remember the mystified looks on their faces as this soldier-professor grilled (through an interpreter) one graybeard after another about the commanders they fought under 20 years ago.

Daowood’s method was different. When a fighting-age male struck him as suspicious, the colonel would use his thumbs and index fingers to pull open both of the man’s eyelids. Then he would lean close and stare searchingly. Usually, after several seconds, as though he had suddenly found precisely what he was looking for, Daowood would declare, in mock surprise, “He’s Taliban!”

It was a joke, of course — one that mostly made fun of the Americans. A few years ago, the coalition embarked on an ambitious enterprise to record in an electronic database the biometric information of hundreds of thousands of Afghan citizens, and a hallmark of American patrols has subsequently been the lining up of villagers to digitally register their eyes and fingerprints. Daowood’s faux iris scan was in part an acknowledgment of the A.N.A.’s inferior technology. But it was also a dig at the coalition’s somewhat desperate reliance on technology. Where Daowood’s interactions with villagers were always intimate, it is hard to imagine a more clinical and alienating dynamic between two people than that of the NATO service member aiming his Hand-held Interagency Identity Detection Equipment at the face of a rural Afghan farmer. In such moments, the difference in the field between the U.S. and Afghan soldier is far starker than that of the foreigner and the native. It is more akin to the difference in the ocean between a scuba diver and a fish.

For example: it never occurred to me that Daowood was being entirely serious when he said he wanted to arrive at the wedding in time for lunch. But as soon as we reached the gathering on the hillside in Ali Shah, we were invited into a house and served generous plates of stewed lamb and rice. Daowood dutifully commenced his anti-establishment diatribe, telling me, in a voice loud enough for everyone to hear: “These are good people, all of them. If the government worked for them, if the government helped them, they wouldn’t fight us. The government officials should come to places like this. They know nothing of the people’s lives outside of Kabul.” When one villager added that “the ministers put all the money in their own accounts, they build themselves nice houses and buy nice cars,” Daowood nodded in sympathetic agreement.

Just outside, meanwhile, some soldiers standing guard discovered a canvas sack full of rocket-propelled grenades stashed behind a boulder. A group of men were spotted fleeing into the mountains, and the day’s fighting began.

Late that night, after the rest of the battalion went to sleep, Daowood set off into a Taliban-controlled village on foot, accompanied by four guards. He wanted to meet with a local Talib, who was also a paid informant. He never said so explicitly — “he’s an old friend” and “he gives me information” was all he allowed — but I had the sense this was the man who warned Daowood about the bombs in the road. There was not much of a moon and just enough starlight to see the ground beneath our feet. As we made our way over a steep hill, along a creek, through a field and into winding streets, a chorus of dogs began to howl, and the four soldiers Daowood dragged along grew nervous. “Don’t worry,” Daowood kept telling them. “We’re close.”

When we reached the Talib’s house, a young boy ushered us into a long narrow room dimly lighted by a gas lantern. Pink lace curtains hung over the windows; plush cushions lined the walls; gaudily decorative carpets covered the floor. The informant was a middle-aged man affecting the usual beard and turban. He embraced Daowood and gestured for us to sit. The boy brought tea and then platters of rice and meat and bread. After a while, Daowood said: “We’re closing the check posts tomorrow. We’re pulling out of here.”

“That will be fine,” the man said. “The aircraft were searching here last night.”

“Just stay inside,” Daowood told him.

His phone rang. When he hung up, Daowood announced, “There’s going to be an ambush tomorrow.” And to the informant: “Tomorrow we’re going to search this area.”

The informant nodded. “There won’t be any problem.”

The next day, there was in fact an ambush — even while the bulldozers and backhoes were leveling the check posts. We were heading up a tight canyon, along the banks of a shallow stream, when rockets and machine guns echoed up ahead. By now, most of the soldiers were ragged with fatigue. Over the past four days, they had walked some 30 miles, stayed up shivering through frigid nights, eaten little more than bread and rice. And they had fought and killed people, too. As Daowood rushed ahead at a brisk pace toward the gunfire, we passed one soldier after another sitting on the side of the trail, leaning against a rock, flushed and spent. “Don’t stop!” Daowood urged them. “You’re in the enemy’s country now! Move like a lion!”

And for the most part — even if not exactly lionlike — the soldiers got up and pushed on.

It’s too early to tell what the Afghan National Army will look like on Dec. 31, 2014. No doubt its level of readiness for the uncertain future will vary hugely from region to region, unit to unit. But it is a mistake to dismiss or disparage the Afghan soldier, as is often done by foreigners in Afghanistan. After the ambush (three insurgents were injured; no soldiers), I walked toward the highway, which we could see through the bare trees at the foot of the valley, alongside a young medic from Daykundi Province named Abdul Karim. Like most of the people from Daykundi, Karim was Hazara, one of Afghanistan’s ethnic minorities. Because they follow the Shia branch of Islam, and because their distinct facial features make them easily recognizable, Hazaras are uniquely vulnerable to militant Sunni fundamentalists. In Afghanistan, this has certainly been true with the Taliban, who, during their rise to power, massacred Hazaras by the thousands. “For my people,” Karim told me, “it is important to serve in this army.” Almost all of the men in his family, he said, enlisted as soon as they were old enough. Twenty-eight of Karim’s brothers and cousins wore the uniform.

There might have been a time early in the war when most American soldiers and Marines genuinely believed that they were fighting to protect their homeland, their watan. But those days are over now; they have been for a while. You can feel it just as surely as you can feel that for soldiers like Karim they will never end.

Almost as soon as we got back to Dash-e Towp, I overheard some U.S. officers loudly complaining about the inability of Afghan soldiers to make appointments on time. Afghan soldiers do have difficulty making appointments on time, it’s true. They also don’t like to stand in straight lines or dress according to regulation or march in step or do so many of the things intrinsic to a Western notion of professional soldiering. When a lieutenant calls a formation of Afghan privates to attention, they will inevitably resemble, as my drill sergeant used to say, “a soup sandwich.” But they will also accept a much higher level of risk than any coalition force ever has. Their ranks are filled with tough and brave men who run toward the fight without body armor or helmets or armored vehicles and sleep on the frozen ground without sleeping bags and dig up I.E.D.’s with a pickax and often go hungry and seldom complain.

It was dark by the time Daowood returned to the base; he wanted to be the last man in. When I visited him in his room, he was sitting on the floor, drinking tea. A small TV played quietly in the corner, and as we talked I heard a broadcaster mention the news: yesterday, Barack Obama was re-elected president. I pointed this out to Daowood, who wasn’t much interested. “They’re all the same to us,” he said. Then, seeing I was taking notes, he added, “We just want someone who will help Afghanistan.” But the colonel seemed to know that in the end that job would be his.

Luke Mogelson is a contributing writer for the magazine and a co-editor of Razistan.org. He last wrote about a lawless Afghanistan border town.

Editor: Joel Lovell

A version of this article appeared in print on January 20, 2013, on page MM28 of the Sunday Magazine with the headline: Which Way Did the Taliban Go?.