Arquivo da tag: Mudanças climáticas

Soap Bubbles for Predicting Cyclone Intensity? (Science Daily)

Jan. 8, 2014 — Could soap bubbles be used to predict the strength of hurricanes and typhoons? However unexpected it may sound, this question prompted physicists at the Laboratoire Ondes et Matière d’Aquitaine (CNRS/université de Bordeaux) to perform a highly novel experiment: they used soap bubbles to model atmospheric flow. A detailed study of the rotation rates of the bubble vortices enabled the scientists to obtain a relationship that accurately describes the evolution of their intensity, and propose a simple model to predict that of tropical cyclones.

Vortices in a soap bubble. (Credit: © Hamid Kellay)

The work, carried out in collaboration with researchers from the Institut de Mathématiques de Bordeaux (CNRS/université de Bordeaux/Institut Polytechnique de Bordeaux) and a team from Université de la Réunion, has just been published in the journal NatureScientific Reports.

Predicting wind intensity or strength in tropical cyclones, typhoons and hurricanes is a key objective in meteorology: the lives of hundreds of thousands of people may depend on it. However, despite recent progress, such forecasts remain difficult since they involve many factors related to the complexity of these giant vortices and their interaction with the environment. A new research avenue has now been opened up by physicists at the Laboratoire Ondes et Matière d’Aquitaine (CNRS/Université Bordeaux 1), who have performed a highly novel experiment using, of all things, soap bubbles.

The researchers carried out simulations of flow on soap bubbles, reproducing the curvature of the atmosphere and approximating as closely as possible a simple model of atmospheric flow. The experiment allowed them to obtain vortices that resemble tropical cyclones and whose rotation rate and intensity exhibit astonishing dynamics-weak initially or just after the birth of the vortex, and increasing significantly over time. Following this intensification phase, the vortex attains its maximum intensity before entering a phase of decline.

A detailed study of the rotation rate of the vortices enabled the researchers to obtain a simple relationship that accurately describes the evolution of their intensity. For instance, the relationship can be used to determine the maximum intensity of the vortex and the time it takes to reach it, on the basis of its initial evolution. This prediction can begin around fifty hours after the formation of the vortex, a period corresponding to approximately one quarter of its lifetime and during which wind speeds intensify. The team then set out to verify that these results could be applied to real tropical cyclones. By applying the same analysis to approximately 150 tropical cyclones in the Pacific and Atlantic oceans, they showed that the relationship held true for such low-pressure systems. This study therefore provides a simple model that could help meteorologists to better predict the strength of tropical cyclones in the future.

Journal Reference:

  1. T. Meuel, Y. L. Xiong, P. Fischer, C. H. Bruneau, M. Bessafi, H. Kellay. Intensity of vortices: from soap bubbles to hurricanesScientific Reports, 2013; 3 DOI:10.1038/srep03455

Researchers Target Sea Level Rise to Save Years of Archaeological Evidence (Science Daily)

Jan. 16, 2014 — Prehistoric shell mounds found on some of Florida’s most pristine beaches are at risk of washing away as the sea level rises, wiping away thousands of years of archaeological evidence.

“The largest risk for these ancient treasure troves of information is sea level rise,” said Shawn Smith, a senior research associate with the Center for Ocean-Atmospheric Prediction Studies at Florida State University.

But a joint project between Smith and the National Park Service is drawing attention to the problem to hopefully minimize the impact on the state’s cultural sites.

Smith and Margo Schwadron, an archaeologist with the National Park Service, have embarked on a project to examine past and future changes in climate and how we can adapt to those changes to save areas of shoreline and thus preserve cultural and archeological evidence.

“We’re kind of the pioneers in looking at the cultural focus of this issue,” Smith said, noting that most weather and ocean experts are concerned about city infrastructure for coastal areas.

To complete the project, the National Park Service awarded Smith a $30,000 grant. With that money, Smith and former Florida State University undergraduate Marcus Johnson spent hours compiling modern, colonial and paleo weather data.

The focus of their initial research is the Canaveral National Seashore and Everglades National Park, which both have prehistoric shell mounds, about 50 feet to 70 feet high. Researchers believe these shell mounds served as foundations for structures and settlements and later served as navigational landmarks during European exploration of the region.

Modern temperature and storm system information was easily available to researchers. But, to go hundreds and then thousands of years back took a slightly different approach.

Log books from old Spanish forts as well as ships that crossed the Atlantic had to be examined to find the missing information.

The result was a comprehensive data set for the region, so detailed that modern era weather conditions are now available by the hour.

Smith and Schwadron are trying to secure more funding to continue their work, but for now, they are making their data set available to the general public and other researchers in hopes of raising awareness about the unexpected effects of sea level rise.

The National Park Service has also published a brochure on climate change and the impact that sea level rise could have on the shell mounds found at Cape Canaveral.

Violence, Infectious Disease and Climate Change Contributed to Indus Civilization Collapse (Science Daily)

Jan. 16, 2014 — A new study on the human skeletal remains from the ancient Indus city of Harappa provides evidence that inter-personal violence and infectious diseases played a role in the demise of the Indus, or Harappan Civilization around 4,000 years ago.

Evidence for maxillary infection in individual G.I.S.15. The lesions included porosity, alveolar resorption, abscessing at the right canine and third premolar, and antemortem tooth loss (a = right ventral view). This individual also had inflammatory changes to the palatine process of the maxilla leading to localized bone destruction and perforation (b = inferior view of palate). There is evidence for porosity and inflammation at the inferior margin of the pyriform aperture, porosity and deformation of the infraorbital foramen caused by infection of the left maxillary sinus (c: ventral view). (Credit: Gwen Robbins Schug, K. Elaine Blevins, Brett Cox, Kelsey Gray, V. Mushrif-Tripathy. Infection, Disease, and Biosocial Processes at the End of the Indus Civilization. PLoS ONE, 2013; 8 (12): e84814 DOI: 10.1371/journal.pone.0084814)

The Indus Civilization stretched over a million square kilometers of what is now Pakistan and India in the Third Millennium B.C. While contemporaneous civilizations in Egypt and Mesopotomia, are well-known, their Indus trading partners have remained more of a mystery.

Archaeological research has demonstrated that Indus cities grew rapidly from 2200-1900 B.C., when they were largely abandoned. “The collapse of the Indus Civilization and the reorganization of its human population has been controversial for a long time,” lead author of the paper published last month in the journal PLOS ONE, Gwen Robbins Schug, explained. Robbins Schug is an associate professor of anthropology at Appalachian State University.

Climate, economic, and social changes all played a role in the process of urbanization and collapse, but little was known about how these changes affected the human population.

Robbins Schug and an international team of researchers examined evidence for trauma and infectious disease in the human skeletal remains from three burial areas at Harappa, one of the largest cities in the Indus Civilization. The results of their analysis counter longstanding claims that the Indus civilization developed as a peaceful, cooperative, and egalitarian state-level society, without social differentiation, hierarchy, or differences in access to basic resources.

The data suggest instead that some communities at Harappa faced more significant impacts than others from climate and socio-economic strains, particularly the socially disadvantaged or marginalized communities who are most vulnerable to violence and disease. This pattern is expected in strongly socially differentiated, hierarchical but weakly controlled societies facing resource stress.

Robbins Schug’s and colleagues’ findings add to the growing body of research about the character of Indus society and the nature of its collapse.

“Early research had proposed that ecological factors were the cause of the demise, but there wasn’t much paleo-environmental evidence to confirm those theories,” Robbins Schug said. “In the past few decades, there have been refinements to the available techniques for reconstructing paleo-environments and burgeoning interest in this field.”

When paleoclimate, archaeology, and human skeletal biology approaches are combined, scientists can glean important insights from the past, addressing long-standing and socially relevant questions.

“Rapid climate change events have wide-ranging impacts on human communities,” Robbins Schug said. “Scientists cannot make assumptions that climate changes will always equate to violence and disease. However, in this case, it appears that the rapid urbanization process in Indus cities, and the increasingly large amount of culture contact, brought new challenges to the human population. Infectious diseases like leprosy and tuberculosis were probably transmitted across an interaction sphere that spanned Middle and South Asia.”

Robbins Schug’s research shows that leprosy appeared at Harappa during the urban phase of the Indus Civilization, and its prevalence significantly increased through time. New diseases, such as tuberculosis, also appear in the Late Harappan or post-urban phase burials. Violent injury such as cranial trauma also increases through time, a finding that is remarkable, she said, given that evidence for violence is very rare in prehistoric South Asian sites generally.

“As the environment changed, the exchange network became increasingly incoherent. When you combine that with social changes and this particular cultural context, it all worked together to create a situation that became untenable,” she said.

The results of the study are striking, according to Robbins Schug, because violence and disease increased through time, with the highest rates found as the human population was abandoning the cities. However, an even more interesting result is that individuals who were excluded from the city’s formal cemeteries had the highest rates of violence and disease. In a small ossuary southeast of the city, men, women, and children were interred in a small pit. The rate of violence in this sample was 50 percent for the 10 crania preserved, and more than 20 percent of these individuals demonstrated evidence of infection with leprosy.

Robbins Schug said lessons from the Indus Civilization are applicable to modern societies.

“Human populations in semi-arid regions of the world, including South Asia, currently face disproportionate impacts from global climate change,” the researchers wrote. “The evidence from Harappa offers insights into how social and biological challenges impacted past societies facing rapid population growth, climate change and environmental degradation. Unfortunately, in this case, increasing levels of violence and disease accompanied massive levels of migration and resource stress and disproportionate impacts were felt by the most vulnerable members of society.”

Journal Reference:

  1. Gwen Robbins Schug, K. Elaine Blevins, Brett Cox, Kelsey Gray, V. Mushrif-Tripathy. Infection, Disease, and Biosocial Processes at the End of the Indus Civilization.PLoS ONE, 2013; 8 (12): e84814 DOI:10.1371/journal.pone.0084814

Learning How to Die in the Anthropocene (New York Times)

November 10, 2013, 3:00 pm

By ROY SCRANTON

Jeffery DelViscio

I.

Driving into Iraq just after the 2003 invasion felt like driving into the future. We convoyed all day, all night, past Army checkpoints and burned-out tanks, till in the blue dawn Baghdad rose from the desert like a vision of hell: Flames licked the bruised sky from the tops of refinery towers, cyclopean monuments bulged and leaned against the horizon, broken overpasses swooped and fell over ruined suburbs, bombed factories, and narrow ancient streets.

Civilizations have marched blindly toward disaster because humans are wired to believe that tomorrow will be much like today.

With “shock and awe,” our military had unleashed the end of the world on a city of six million — a city about the same size as Houston or Washington. The infrastructure was totaled: water, power, traffic, markets and security fell to anarchy and local rule. The city’s secular middle class was disappearing, squeezed out between gangsters, profiteers, fundamentalists and soldiers. The government was going down, walls were going up, tribal lines were being drawn, and brutal hierarchies savagely established.

I was a private in the United States Army. This strange, precarious world was my new home. If I survived.

Two and a half years later, safe and lazy back in Fort Sill, Okla., I thought I had made it out. Then I watched on television as Hurricane Katrina hit New Orleans. This time it was the weather that brought shock and awe, but I saw the same chaos and urban collapse I’d seen in Baghdad, the same failure of planning and the same tide of anarchy. The 82nd Airborne hit the ground, took over strategic points and patrolled streets now under de facto martial law. My unit was put on alert to prepare for riot control operations. The grim future I’d seen in Baghdad was coming home: not terrorism, not even W.M.D.’s, but a civilization in collapse, with a crippled infrastructure, unable to recuperate from shocks to its system.

And today, with recovery still going on more than a year after Sandy and many critics arguing that the Eastern seaboard is no more prepared for a huge weather event than we were last November, it’s clear that future’s not going away.

This March, Admiral Samuel J. Locklear III, the commander of the United States Pacific Command, told security and foreign policy specialists in Cambridge, Mass., that global climate change was the greatest threat the United States faced — more dangerous than terrorism, Chinese hackers and North Korean nuclear missiles. Upheaval from increased temperatures, rising seas and radical destabilization “is probably the most likely thing that is going to happen…” he said, “that will cripple the security environment, probably more likely than the other scenarios we all often talk about.’’

Locklear’s not alone. Tom Donilon, the national security adviser,said much the same thing in April, speaking to an audience at Columbia’s new Center on Global Energy Policy. James Clapper, director of national intelligence, told the Senate in March that “Extreme weather events (floods, droughts, heat waves) will increasingly disrupt food and energy markets, exacerbating state weakness, forcing human migrations, and triggering riots, civil disobedience, and vandalism.”

On the civilian side, the World Bank’s recent report, “Turn Down the Heat: Climate Extremes, Regional Impacts, and the Case for Resilience,” offers a dire prognosis for the effects of global warming, which climatologists now predict will raise global temperatures by 3.6 degrees Fahrenheit within a generation and 7.2 degrees Fahrenheit within 90 years. Projections from researchers at the University of Hawaii find us dealing with “historically unprecedented” climates as soon as 2047. The climate scientist James Hansen, formerly with NASA, has argued that we face an “apocalyptic” future. This grim view is seconded by researchers worldwide, including Anders LevermannPaul and Anne Ehrlich,Lonnie Thompson and manymanymany others.

This chorus of Jeremiahs predicts a radically transformed global climate forcing widespread upheaval — not possibly, not potentially, but inevitably. We have passed the point of no return. From the point of view of policy experts, climate scientists and national security officials, the question is no longer whether global warming exists or how we might stop it, but how we are going to deal with it.

II.

There’s a word for this new era we live in: the Anthropocene. This term, taken up by geologistspondered by intellectuals and discussed in the pages of publications such as The Economist and the The New York Times, represents the idea that we have entered a new epoch in Earth’s geological history, one characterized by the arrival of the human species as a geological force. The biologist Eugene F. Stoermer and the Nobel-Prize-winning chemist Paul Crutzen advanced the term in 2000, and it has steadily gained acceptance as evidence has increasingly mounted that the changes wrought by global warming will affect not just the world’s climate and biological diversity, but its very geology — and not just for a few centuries, but for millenniums. The geophysicist David Archer’s 2009 book, “The Long Thaw: How Humans are Changing the Next 100,000 Years of Earth’s Climate,” lays out a clear and concise argument for how huge concentrations of carbon dioxide in the atmosphere and melting ice will radically transform the planet, beyond freak storms and warmer summers, beyond any foreseeable future.

The Stratigraphy Commission of the Geological Society of London — the scientists responsible for pinning the “golden spikes” that demarcate geological epochs such as the Pliocene, Pleistocene, and Holocene — have adopted the Anthropocene as a term deserving further consideration, “significant on the scale of Earth history.” Working groups are discussing what level of geological time-scale it might be (an “epoch” like the Holocene, or merely an “age” like the Calabrian), and at what date we might say it began. The beginning of the Great Acceleration, in the middle of the 20th century? The beginning of the Industrial Revolution, around 1800? The advent of agriculture?

Every day I went out on mission in Iraq, I looked down the barrel of the future and saw a dark, empty hole.

The challenge the Anthropocene poses is a challenge not just to national security, to food and energy markets, or to our “way of life” — though these challenges are all real, profound, and inescapable. The greatest challenge the Anthropocene poses may be to our sense of what it means to be human. Within 100 years — within three to five generations — we will face average temperatures 7 degrees Fahrenheit higher than today, rising seas at least three to 10 feet higher, and worldwide shifts in crop belts, growing seasons and population centers. Within a thousand years, unless we stop emitting greenhouse gases wholesale right now, humans will be living in a climate the Earth hasn’t seen since the Pliocene, three million years ago, when oceans were 75 feet higher than they are today. We face the imminent collapse of the agricultural, shipping and energy networks upon which the global economy depends, a large-scale die-off in the biosphere that’s already well on its way, and our own possible extinction. If homo sapiens (or some genetically modified variant) survives the next millenniums, it will be survival in a world unrecognizably different from the one we have inhabited.

Jeffery DelViscio

Geological time scales, civilizational collapse and species extinction give rise to profound problems that humanities scholars and academic philosophers, with their taste for fine-grained analysis, esoteric debates and archival marginalia, might seem remarkably ill suited to address. After all, how will thinking about Kant help us trap carbon dioxide? Can arguments between object-oriented ontology and historical materialism protect honeybees from colony collapse disorder? Are ancient Greek philosophers, medieval theologians, and contemporary metaphysicians going to keep Bangladesh from being inundated by rising oceans?

Of course not. But the biggest problems the Anthropocene poses are precisely those that have always been at the root of humanistic and philosophical questioning: “What does it mean to be human?” and “What does it mean to live?” In the epoch of the Anthropocene, the question of individual mortality — “What does my life mean in the face of death?” — is universalized and framed in scales that boggle the imagination. What does human existence mean against 100,000 years of climate change? What does one life mean in the face of species death or the collapse of global civilization? How do we make meaningful choices in the shadow of our inevitable end?

These questions have no logical or empirical answers. They are philosophical problems par excellence. Many thinkers, including Cicero, Montaigne, Karl Jaspers, and The Stone’s own Simon Critchley, have argued that studying philosophy is learning how to die. If that’s true, then we have entered humanity’s most philosophical age — for this is precisely the problem of the Anthropocene. The rub is that now we have to learn how to die not as individuals, but as a civilization.

III.

Learning how to die isn’t easy. In Iraq, at the beginning, I was terrified by the idea. Baghdad seemed incredibly dangerous, even though statistically I was pretty safe. We got shot at and mortared, and I.E.D.’s laced every highway, but I had good armor, we had a great medic, and we were part of the most powerful military the world had ever seen. The odds were good I would come home. Maybe wounded, but probably alive. Every day I went out on mission, though, I looked down the barrel of the future and saw a dark, empty hole.

“For the soldier death is the future, the future his profession assigns him,” wrote  Simone Weil in her remarkable meditation on war, “The Iliad or the Poem of Force.” “Yet the idea of man’s having death for a future is abhorrent to nature. Once the experience of war makes visible the possibility of death that lies locked up in each moment, our thoughts cannot travel from one day to the next without meeting death’s face.” That was the face I saw in the mirror, and its gaze nearly paralyzed me.

I found my way forward through an 18th-century Samurai manual, Yamamoto Tsunetomo’s “Hagakure,” which commanded: “Meditation on inevitable death should be performed daily.” Instead of fearing my end, I owned it. Every morning, after doing maintenance on my Humvee, I’d imagine getting blown up by an I.E.D., shot by a sniper, burned to death, run over by a tank, torn apart by dogs, captured and beheaded, and succumbing to dysentery. Then, before we rolled out through the gate, I’d tell myself that I didn’t need to worry, because I was already dead. The only thing that mattered was that I did my best to make sure everyone else came back alive. “If by setting one’s heart right every morning and evening, one is able to live as though his body were already dead,” wrote Tsunetomo, “he gains freedom in the Way.”

I got through my tour in Iraq one day at a time, meditating each morning on my inevitable end. When I left Iraq and came back stateside, I thought I’d left that future behind. Then I saw it come home in the chaos that was unleashed after Katrina hit New Orleans. And then I saw it again when Sandy battered New York and New Jersey: Government agencies failed to move quickly enough, and volunteer groups like Team Rubicon had to step in to manage disaster relief.

Now, when I look into our future — into the Anthropocene — I see water rising up to wash out lower Manhattan. I see food riots, hurricanes, and climate refugees. I see 82nd Airborne soldiers shooting looters. I see grid failure, wrecked harbors, Fukushima waste, and plagues. I see Baghdad. I see the Rockaways. I see a strange, precarious world.

Our new home.

The human psyche naturally rebels against the idea of its end. Likewise, civilizations have throughout history marched blindly toward disaster, because humans are wired to believe that tomorrow will be much like today — it is unnatural for us to think that this way of life, this present moment, this order of things is not stable and permanent. Across the world today, our actions testify to our belief that we can go on like this forever, burning oil, poisoning the seas, killing off other species, pumping carbon into the air, ignoring the ominous silence of our coal mine canaries in favor of the unending robotic tweets of our new digital imaginarium. Yet the reality of global climate change is going to keep intruding on our fantasies of perpetual growth, permanent innovation and endless energy, just as the reality of mortality shocks our casual faith in permanence.

The biggest problem climate change poses isn’t how the Department of Defense should plan for resource wars, or how we should put up sea walls to protect Alphabet City, or when we should evacuate Hoboken. It won’t be addressed by buying a Prius, signing a treaty, or turning off the air-conditioning. The biggest problem we face is a philosophical one: understanding that this civilization is already dead. The sooner we confront this problem, and the sooner we realize there’s nothing we can do to save ourselves, the sooner we can get down to the hard work of adapting, with mortal humility, to our new reality.

The choice is a clear one. We can continue acting as if tomorrow will be just like yesterday, growing less and less prepared for each new disaster as it comes, and more and more desperately invested in a life we can’t sustain. Or we can learn to see each day as the death of what came before, freeing ourselves to deal with whatever problems the present offers without attachment or fear.

If we want to learn to live in the Anthropocene, we must first learn how to die.

Europe to Suffer from More Severe and Persistent Droughts (Science Daily)

Jan. 9, 2014 — As Europe is battered by storms, new research reminds us of the other side of the coin. By the end of this century, droughts in Europe are expected to be more frequent and intense due to climate change and increased water use.

Dry river bed in a peat upland in Northern England. (Credit: Catherine Moody, distributed via imaggeo.egu.eu)

These results, by researchers from the European Commission’s Joint Research Centre (JRC) and the University of Kassel in Germany, are published today in Hydrology and Earth System Sciences, an open access journal of the European Geosciences Union (EGU).

“Our research shows that many river basins, especially in southern parts of Europe, are likely to become more prone to periods of reduced water supply due to climate change,” says Giovanni Forzieri, a researcher in climate risk management at the JRC and lead author of the study. “An increasing demand for water, following a growing population and intensive use of water for irrigation and industry, will result in even stronger reductions in river flow levels.”

Drought is a major natural disaster that can have considerable impacts on society, the environment and the economy. In Europe alone, the cost of drought over the past three decades has amounted to over 100 billion euros. In this study, the researchers wanted to find out if and where in Europe increasing temperatures and intensive water consumption could make future droughts more severe and long-lasting.

To do this, they analysed climate and hydrological models under different scenarios. “Scenarios are narratives of possible evolutions — up to 2100 in this study — of our society that we use to quantify future greenhouse gas emissions and water consumption by different sectors,” explains Luc Feyen, a hydrologist at JRC and co-author of the paper. “Climate and water-use models then translate the greenhouse gas concentrations and water requirement into future climate and water consumption projections.”

The scientists then used these projected conditions to drive a hydrological model that mimics the distribution and flow of water on Earth. By running this model until 2100 for all river basins in Europe, they could evaluate how drought conditions may change in magnitude and severity over the 21st century.

The research shows that southern parts of Europe will be the most affected. Stream and river minimum flow levels may be lowered by up to 40% and periods of water deficiency may increase up to 80% due to climate change alone in the Iberian Peninsula, south of France, Italy and the Balkans.

Higher temperatures not only result in more water being evaporated from soils, trees and bodies of water, but will also lead to more frequent and prolonged dry spells, reducing water supply and worsening droughts. The emission scenario used in the study predicts that average global temperature will increase by up to 3.4°C by 2100, relative to the period 1961-1990. But the authors warn that the warming projected for Europe, particularly its southern regions, is even stronger. “Over the Iberian Peninsula, for example, summer mean temperature is projected to increase by up to 5°C by the end of this century,” says Feyen.

In addition to climate warming, intensive water use will further aggravate drought conditions by 10-30% in southern Europe, as well as in the west and centre of the continent, and in some parts of the UK.

“The results of this study emphasise the urgency of sustainable water resource management that is able to adapt to these potential changes in the hydrological system to minimise the negative socio-economic and environmental impacts,” Forzieri concludes.

Journal Reference:

  1. G. Forzieri, L. Feyen, R. Rojas, M. Flörke, F. Wimmer, A. Bianchi. Ensemble projections of future streamflow droughts in EuropeHydrology and Earth System Sciences, 2014; 18 (1): 85 DOI: 10.5194/hess-18-85-2014

Climate Engineering: What Do the Public Think? (Science Daily)

Jan. 12, 2014 — Members of the public have a negative view of climate engineering, the deliberate large-scale manipulation of the environment to counteract climate change, according to a new study.

The results are from researchers from the University of Southampton and Massey University (New Zealand) who have undertaken the first systematic large-scale evaluation of the public reaction to climate engineering.

The work is published in Nature Climate Change this week (12 January 2014).

Some scientists think that climate engineering approaches will be required to combat the inexorable rise in atmospheric CO2 due to the burning of fossil fuels. Climate engineering could involve techniques that reduce the amount of CO2 in the atmosphere or approaches that slow temperature rise by reducing the amount of sunlight reaching the Earth’s surface.

Co-author Professor Damon Teagle of the University of Southampton said: “Because even the concept of climate engineering is highly controversial, there is pressing need to consult the public and understand their concerns before policy decisions are made.”

Lead author, Professor Malcolm Wright of Massey University, said: “Previous attempts to engage the public with climate engineering have been exploratory and small scale. In our study, we have drawn on commercial methods used to evaluate brands and new product concepts to develop a comparative approach for evaluating the public reaction to a variety of climate engineering concepts.”

The results show that the public has strong negative views towards climate engineering. Where there are positive reactions, they favour approaches that reduce carbon dioxide over those that reflected sunlight.

“It was a striking result and a very clear pattern,” said Professor Wright. “Interventions such as putting mirrors in space or fine particles into the stratosphere are not well received. More natural processes of cloud brightening or enhanced weathering are less likely to raise objections, but the public react best to creating biochar (making charcoal from vegetation to lock in CO2) or capturing carbon directly from the air.”

Nonetheless, even the most well regarded techniques still has a net negative perception.

The work consulted large representative samples in both Australia and New Zealand. Co-author Pam Feetham said: “The responses are remarkably consistent from both countries, with surprisingly few variations except for a slight tendency for older respondents to view climate engineering more favourably.”

Professor Wright noted that giving the public a voice so early in technological development was unusual, but increasingly necessary. “If these techniques are developed the public must be consulted. Our methods can be employed to evaluate the responses in other countries and reapplied in the future to measure how public opinion changes as these potential new technologies are discussed and developed,” he said.

Journal Reference:

  1. Malcolm J. Wright, Damon A. H. Teagle, Pamela M. Feetham. A quantitative evaluation of the public response to climate engineeringNature Climate Change, 2014; DOI: 10.1038/nclimate2087

Our singularity future: should we hack the climate? (Singularity Hub)

Written By: 

Posted: 01/8/14 8:31 AM

Basaltlake-coring_greenland

Even the most adamant techno-optimists among us must admit that new technologies can introduce hidden dangers: Fire, as the adage goes, can cook the dinner, but it can also burn the village down.

The most powerful example of unforeseen disadvantages stemming from technology is climate change. Should we attempt to fix a problem caused by technology, using more novel technology to hack the climate? The question has spurred heated debate.

Those in favor point to failed efforts to curb carbon dioxide emissions and insist we need other options. What if a poorly understood climatic tipping point tips and the weather becomes dangerous overnight; how will slowing emissions help us then?

“If you look at the projections for how much the Earth’s air temperature is supposed to warm over the next century, it is frightening. We should at least know the options,” said Rob Wood, a University of Washington climatologist who edited a recent special issue of the journal Climatic Change devoted to geoengineering.

Wood’s view is gaining support, as the predictions about the effects of climate change continue to grow more dire, and the weather plays its part to a tee.

But big, important questions need answers before geoengineering projects take off. Critics point to science’s flimsy understanding of the complex systems that drive the weather. And even supporters lament the lack of any experimental framework to contain disparate experiments on how to affect it.

“Proposed projects have been protested or canceled, and calls for a governance framework abound,” Lisa Dilling and Rachel Hauser wrote in a paper that appears in the special issue. “Some have argued, even, that it is difficult if not impossible to answer some research questions in geoengineering at the necessary scale without actually implementing geoengineering itself.”

Most proposed methods of geoengineering derive from pretty basic science, but questions surround how to deploy them at a planetary scale and how to measure desired and undesired effects on complex weather and ocean cycles. Research projects that would shed light on those questions would be big enough themselves potentially to affect neighboring populations, raising ethical questions as well.

stratoshieldEarlier efforts to test fertilizing the ocean with iron to feed algae that would suck carbon dioxide from the air and to spray the pollutant sulfur dioxide, which reflects solar radiation, into the atmosphere were mired in controversy. A reputable UK project abandoned its plans to test its findings in the field.

But refinements on those earlier approaches are percolating. They include efforts both to remove previously emitted carbon dioxide from the atmosphere and to reduce the portion of the sun’s radiation that enters the atmosphere.

One method of carbon dioxide removal (or CDR) would expose large quantities of carbon-reactive minerals to the air and then store the resulting compounds underground; another would use large C02 vacuums to suck the greenhouse gas directly from the air into underground storage.

Solar radiation management (or SRM) methods include everything from painting roofs white to seeding the clouds with salt crystals to make them more reflective and mimicking the climate-cooling effects of volcanic eruptions by spraying  sulfur compounds into the atmosphere.

The inevitable impact of geoengineering research on the wider population has led many scientists to compare geoengineering to genetic research. The comparison to genetic research also hints at the huge benefits geoengineering could have if it successfully wards off the most savage effects of climate change.

As with genetic research, principles have been developed to shape the ethics of the research. Still, the principles remain vague, according to a 2012 Nature editorial, and flawed, according to a philosophy-of-science take in the recent journal issue. Neither the U.S. government nor international treaties have addressed geoengineering per se, though many treaties would influence its testing implementation.

The hottest research now explores how long climate-hacks would take to work, lining up their timelines with the slow easing of global warming that would result from dramatically lowered carbon dioxide emissions, and how to weigh the costs of geoengineering projects and accommodate public debate.

Proceeding with caution won’t get fast answers, but it seems a wise way to address an issue as thorny as readjusting the global thermostat.

Climate change rattles mental health of Inuit in Labrador (CBC)

‘Grief, mourning, anger, frustration’ over environmental changes

CBC News Posted: Jan 10, 2014 5:22 PM ET Last Updated: Jan 10, 2014 5:58 PM ET

This photo supplied by researcher Ashlee Cunsolo Willox shows cabins in Double Mer just outside of Rigolet in Nunatsiavut, Labrador. Climate change has caused ice to break up or not form at all, making it difficult for Inuit populations to access the cabins they use as a base for hunting and trapping.This photo supplied by researcher Ashlee Cunsolo Willox shows cabins in Double Mer just outside of Rigolet in Nunatsiavut, Labrador. Climate change has caused ice to break up or not form at all, making it difficult for Inuit populations to access the cabins they use as a base for hunting and trapping. (Couresty My Word: Storytelling & Digital Media Lab)

Researchers studying the mental health and well-being of Inuit populations in coastal Labrador say rising temperatures are having damaging psychological effects on people in traditional communities.

‘Many people said they also felt very depressed about not being able to get out there on the land’– Ashlee Cunsolo Willox, researcher for Inuit Mental Health Adaptation to Climate Change project

In an interview airing on CBC Radio’s Quirks & Quarks on Saturday, Dr. Ashlee Cunsolo Willox, who has been working in partnership with Inuit communities in Nunatsiavut since 2009, describes intense feelings of isolation among people there following temperature changes that have caused disruptions in how the ice and snow are interacting.

“The North Labrador Coast is one of the fastest-changing and fastest-warming areas anywhere in the world,” she told host Bob McDonald. “In particular, rising temperatures have led to a real decrease in sea ice.”

There were strong emotional reactions to that loss among all 120 people interviewed by researchers behind the community-based Inuit Mental Health Adaptation to Climate Change project.

The feelings included a sense of grief, mourning, anger, frustration, sadness, and many people said they also felt very depressed about not being able to get out there on the land,” Cunsolo Willox said.

Traditional routes no longer safe

Wildlife and vegetation have changed, with caribou and moose moving further north, and traditional berries have been failing to grow when they have in the past.

“In some cases, they’re getting less snow than before, which makes it very difficult to travel inland by Ski-Doo or by dog team,” added Cunsolo Willox, who holds the Canada Research Chair in Determinants of Healthy Communities at Cape Breton University.

She and her colleagues interviewed people in the communities of Nain, Hopedale, Postville, Makkovik and Rigolet, and their work is run in partnership with the Rigolet Inuit Community Government. The majority of those interviewed are Inuit.

“People describe themselves as land people, as people of the snow and the ice, and would say that going out on the land and hunting and trapping and fishing [is] just as much part of their life as breathing,” Cunsolo Willox said.

The full interview will be broadcast on Saturday’s program at noon.

Scientists: Americans are becoming weather wimps (AP)

By SETH BORENSTEIN

— Jan. 9, 2014 5:33 PM EST

Deep Freeze Weather Wimps

FILE – In this Sunday, Jan. 5, 2014, file photo, a person struggles to cross a street in blowing and falling snow as the Gateway Arch appears in the distance, in St. Louis. The deep freeze that gripped much of the nation this week wasn’t unprecedented, but with global warming we’re getting far fewer bitter cold spells, and many of us have forgotten how frigid winter used to be. (AP Photo/Jeff Roberson, File)

WASHINGTON (AP) — We’ve become weather wimps.

As the world warms, the United States is getting fewer bitter cold spells like the one that gripped much of the nation this week. So when a deep freeze strikes, scientists say, it seems more unprecedented than it really is. An Associated Press analysis of the daily national winter temperature shows that cold extremes have happened about once every four years since 1900.

Until recently.

When computer models estimated that the national average daily temperature for the Lower 48 states dropped to 17.9 degrees on Monday, it was the first deep freeze of that magnitude in 17 years, according to Greg Carbin, warning meteorologist for the National Oceanic and Atmospheric Administration.

That stretch — from Jan. 13, 1997 to Monday — is by far the longest the U.S. has gone without the national average plunging below 18 degrees, according to a database of daytime winter temperatures starting in January 1900.

In the past 115 years, there have been 58 days when the national average temperature dropped below 18. Carbin said those occurrences often happen in periods that last several days so it makes more sense to talk about cold outbreaks instead of cold days. There have been 27 distinct cold snaps.

Between 1970 and 1989, a dozen such events occurred, but there were only two in the 1990s and then none until Monday.

“These types of events have actually become more infrequent than they were in the past,” said Carbin, who works at the Storm Prediction Center in Norman, Okla. “This is why there was such a big buzz because people have such short memories.”

Said Jeff Masters, meteorology director of the private firm Weather Underground: “It’s become a lot harder to get these extreme (cold) outbreaks in a planet that’s warming.”

And Monday’s breathtaking chill? It was merely the 55th coldest day — averaged for the continental United States — since 1900.

The coldest day for the Lower 48 since 1900 — as calculated by the computer models — was 12 degrees on Christmas Eve 1983, nearly 6 degrees chillier than Monday.

The average daytime winter temperature is about 33 degrees, according to Carbin’s database.

There have been far more unusually warm winter days in the U.S. than unusually cold ones.

Since Jan. 1, 2000, only two days have ranked in the top 100 coldest: Monday and Tuesday. But there have been 13 in the top 100 warmest winter days, including the warmest since 1900: Dec. 3, 2012. And that pattern is exactly what climate scientists have been saying for years, that the world will get more warm extremes and fewer cold extremes.

Nine of 11 outside climate scientists and meteorologists who reviewed the data for the AP said it showed that as the world warms from heat-trapping gas spewed by the burning of fossil fuels, winters are becoming milder. The world is getting more warm extremes and fewer cold extremes, they said.

“We expect to see a lengthening of time between cold air outbreaks due to a warming climate, but 17 years between outbreaks is probably partially due to an unusual amount of natural variability,” or luck, Masters said in an email. “I expect we’ll go far fewer than 17 years before seeing the next cold air outbreak of this intensity.

And the scientists dismiss global warming skeptics who claim one or two cold days somehow disproves climate change.

“When your hands are freezing off trying to scrape the ice off your car, it can be all too tempting to say, ‘Where’s global warming now? I could use a little of that!’ But you know what? It’s not as cold as it used to be anymore,” Texas Tech University climate scientist Katharine Hayhoe said in an email.

The recent cold spell, which was triggered by a frigid air mass known as the polar vortex that wandered way south of normal, could also be related to a relatively new theory that may prove a weather wild card, said Rutgers University climate scientist Jennifer Francis. Her theory, which has divided mainstream climate scientists, says that melting Arctic sea ice is changing polar weather, moving the jet stream and causing “more weirdness.”

Ryan Maue, a meteorologist with the private firm Weather Bell Analytics who is skeptical about blaming global warming for weather extremes, dismisses Francis’ theory and said he has concerns about the accuracy of Carbin’s database. Maue has his own daily U.S. average temperature showing that Monday was colder than Carbin’s calculations.

Still, he acknowledged that cold nationwide temperatures “occurred with more regularity in the past.”

Many climate scientists say Americans are weather weenies who forgot what a truly cold winter is like.

“I think that people’s memory about climate is really terrible,” Texas A&M University climate scientist Andrew Dessler wrote in an email. “So I think this cold event feels more extreme than it actually is because we’re just not used to really cold winters anymore.”

Antarctic Emperor Penguins May Be Adapting to Warmer Temperatures (Science Daily)

Jan. 9, 2014 — A new study of four Antarctic emperor penguin colonies suggest that unexpected breeding behaviour may be a sign that the birds are adapting to environmental change.

Emperor penguin colony viewed from the air. (Credit: Ian Potten)

Analysis of satellite observations reveals that penguin colonies moved from their traditional breeding grounds during years when the thin layer of ice (sea ice) formed later than usual to the much thicker floating ice shelves that surround the continent.

Reporting this week in the online journal,PLOS ONE, a team of scientists from British Antarctic Survey (BAS), the Australian Antarctic Division and the Scripps Institution of Oceanography at UC San Diego in California, describe this extraordinary change in behaviour.

Lead author, Peter Fretwell of BAS said, “These charismatic birds tend to breed on the sea ice because it gives them relatively easy access to waters where they hunt for food. Satellite observations captured of one colony in 2008, 2009 and 2010 show that the concentration of annual sea ice was dense enough to sustain a colony. But this was not the case in 2011 and 2012 when the sea ice did not form until a month after the breeding season began. During those years the birds moved up onto the neighbouring floating ice shelf to raise their young.

“What’s particularly surprising is that climbing up the sides of a floating ice shelf — which at this site can be up to 30 metres high — is a very difficult manoeuvre for emperor penguins. Whilst they are very agile swimmers they have often been thought of as clumsy out of the water.”

The emperor penguins’ reliance on sea ice as a breeding platform coupled with recent concern about changing patterns of sea ice has led to the species being designated as ‘near threatened’ by the IUCN red list. The discovery suggests the species may be capable of adapting their behaviour.

In recent years satellite technology has significantly enhanced the scientists’ ability to locate and monitor emperor penguin populations.

Barbara Wienecke of the Australian Antarctic Division said, “These new findings are an important step forward in helping us understand what the future may hold for these animals, however, we cannot assume that this behaviour is widespread in other penguin populations. The ability of these four colonies to relocate to a different environment — from sea ice to ice shelf — in order to cope with local circumstances, was totally unexpected. We have yet to discover whether or not other species may also be adapting to changing environmental conditions.”

Gerald Kooyman, of the Scripps Institution added: “Without satellite imagery these moves onto shelf ice would not have been detected. It is likely that there are other nuances of the emperor penguin environment that will be detected sooner through their behaviour than by more conventional means of measuring environmental changes.”

Whereas sea-ice is frozen salt water, ice shelves are made up of glacial ice that has flowed from the land onto the sea. At the outer edge of an ice shelf ice cliffs can form and these can be anything up to 60 metres high.

Journal Reference:

  1. Peter T. Fretwell, Phil N. Trathan, Barbara Wienecke, Gerald L. Kooyman. Emperor Penguins Breeding on Iceshelves.PLoS ONE, 2014; 9 (1): e85285 DOI:10.1371/journal.pone.0085285

Ecossistemas costeiros ganham destaque na mitigação climática (CarbonoBrasil)

07/1/2014 – 11h55

por Fernanda B. Müller, do CarbonoBrasil

manguezal1 300x196 Ecossistemas costeiros ganham destaque na mitigação climática

Pesquisador ressalta que acessar o potencial de absorção do carbono por manguezais e outros habitats marinho-costeiros poderia ajudar o Brasil conservar e gerir estes ambientes.

A cada ano que passa, a ciência traz novos dados indicando que os ecossistemas marinhos são elementares na captura e armazenamento do dióxido de carbono (CO2) atmosférico – tendo absorvido até um terço dessas emissões provenientes das atividades humanas.

O chamado ‘carbono azul’ é estocado em ambientes tão diversos como manguezais, marismas, gramas marinhas, recifes de coral e outros ecossistemas, intensamente pressionados pelas atividades antrópicas.

Além disso, esses ambientes costeiros são alguns dos mais produtivos no planeta, e fornecem serviços ecossistêmicos essenciais, como proteção costeira contra tempestades e refúgio para o nascimento de grande parte da vida marinha.

Segundo dados da Iniciativa para o Carbono Azul, 83% do ciclo do carbono global passa pelo oceano, e, mesmo com os habitats costeiros cobrindo menos de 2% da sua área, eles equivalem a cerca da metade do carbono sequestrado no oceano.

Entretanto, todo esse potencial está sendo perdido a taxas alarmantes. Um estudo publicado em 2012 no periódico PLOS One alerta que a contínua destruição desses ambientes é responsável pela liberação anual de quase um bilhão de toneladas de dióxido de carbono.

“A perturbação do carbono estocado na biomassa e no metro superior do sedimento em um hectare de manguezal típico pode contribuir com tantas emissões quanto três a cinco hectares de florestas tropicais. Mesmo um hectare de grama marinha, com a sua pequena biomassa viva, pode conter tanto carbono próximo à superfície quanto um hectare de floresta tropical”, ressaltou o estudo.

O potencial de mitigação das mudanças climáticas do ‘carbono azul’ está chamando a atenção de várias instituições internacionais, que, interessadas na preservação dos ecossistemas marinhos, vêm estudando as oportunidades que o cenário internacional de desenvolvimento de baixo carbono pode apresentar.

“Esta conexão com as mudanças climáticas despertou o interesse da comunidade conservacionista, curiosa sobre se atividades de mitigação e financiamento poderiam avançar práticas de manejo sustentável e adaptação nas zonas costeiras”, comentou Stephen Crooks, pesquisador da Universidade East Anglia, que teve seu trabalho com ‘carbono azul’ utilizado durante painéis da Conferência das Partes nº 16 da UNFCCC.

Para trazer informações sobre o assunto, o Programa das Nações Unidas sobre Meio Ambiente (PNUMA) lançou recentemente uma página na internet chamada “The Blue Carbon Portal”, com um fórum de discussões e uma plataforma para networking, além de mostrar iniciativas, notícias e eventos. O portal oferece um mapa com as iniciativas que estão sendo conduzidas em nível nacional, como na Costa Rica, Austrália, Indonésia, entre outros.

Em uma frente mais propositiva, a Conservação Internacional, a União Internacional para a Conservação da Natureza (IUCN) e a Comissão Intergovernamental Oceanográfica da UNESCO lançaram a Iniciativa para o Carbono Azul (Blue Carbon Initiative), um programa global para mitigação das mudanças climáticas através da restauração e do uso sustentável dos ecossistemas marinhos costeiros.

Crooks, que faz parte da Iniciativa para o Carbono Azul, relata que as atividades em torno do reconhecimento do ‘carbono azul’ evoluíram muito nos últimos meses.

No mercado voluntário de carbono, o renomado Verified Carbon Standard (VCS) reconheceu a ‘Restauração e Conservação de Áreas Úmidas’ como uma atividade elegível para criação de créditos de carbono. Ou seja, projetos voltados para a redução das emissões por desmatamento e degradação (REDD) já podem ser desenvolvidos nestas áreas.

Além disso, o Painel Intergovernamental sobre Mudanças Climáticas (IPCC) recentemente adotou diretrizes para a contabilização das emissões e remoções de gases do efeito estufa (GEEs) associadas ao manejo de áreas úmidas (manguezais, marismas, gramas marinhas).

Porém, os países ainda não são obrigados a calcular suas emissões de áreas úmidas, estando convidados pelo IPCC a testarem a metodologia até 2017.

O documento inclui diretrizes para a contabilização de emissões associadas à drenagem ou reposição de água em áreas úmidas e também para o desmatamento, extração de solo, aquicultura, drenagem e restauração de manguezais.

“A coordenação científica no Brasil poderia apoiar enormemente o desenvolvimento de políticas para o manejo das reservas costeiras de carbono e ajudaria na aplicação da contabilização nacional das emissões e remoções de GEEs de atividades humanas em áreas úmidas”, comentou Crooks.

* Publicado originalmente no site CarbonoBrasil.

Major Reductions in Seafloor Marine Life from Climate Change by 2100 (Science Daily)

Dec. 31, 2013 — A new study quantifies for the first time future losses in deep-sea marine life, using advanced climate models. Results show that even the most remote deep-sea ecosystems are not safe from the impacts of climate change. 

Large animals (megafauna), such as this hydroid Corymorpha glacialis, are projected to suffer major declines under the latest climate change predictions. (Credit: National Oceanography Centre)

An international team of scientists predict seafloor dwelling marine life will decline by up to 38 per cent in the North Atlantic and over five per cent globally over the next century. These changes will be driven by a reduction in the plants and animals that live at the surface of the oceans that feed deep-sea communities. As a result, ecosystem services such as fishing will be threatened.

In the study, led by the National Oceanography Centre, the team used the latest suite of climate models to predict changes in food supply throughout the world oceans. They then applied a relationship between food supply and biomass calculated from a huge global database of marine life.

The results of the study are published this week in the scientific journal Global Change Biology.

These changes in seafloor communities are expected despite living on average four kilometres under the surface of the ocean. This is because their food source, the remains of surface ocean marine life that sink to the seafloor, will dwindle because of a decline in nutrient availability. Nutrient supplies will suffer because of climate impacts such as a slowing of the global ocean circulation, as well as increased separation between water masses — known as ‘stratification’ — as a result of warmer and rainier weather.

Lead author Dr Daniel Jones says: “There has been some speculation about climate change impacts on the seafloor, but we wanted to try and make numerical projections for these changes and estimate specifically where they would occur.

“We were expecting some negative changes around the world, but the extent of changes, particularly in the North Atlantic, were staggering. Globally we are talking about losses of marine life weighing more than every person on the planet put together.”

The projected changes in marine life are not consistent across the world, but most areas will experience negative change. Over 80 per cent of all identified key habitats — such as cold-water coral reefs, seamounts and canyons — will suffer losses in total biomass. The analysis also predicts that animals will get smaller. Smaller animals tend to use energy less efficiently, thereby impacting seabed fisheries and exacerbating the effects of the overall declines in available food.

The study was funded by the Natural Environment Research Council (NERC) as part of the Marine Environmental Mapping Programme (MAREMAP), and involved researchers from the National Oceanography Centre, the Memorial University of Newfoundland, Canada, the University of Tasmania, and the Laboratoire des Sciences du Climat et de l’Environnement, France.

Journal Reference:

  1. Daniel O. B. Jones, Andrew Yool, Chih-Lin Wei, Stephanie A. Henson, Henry A. Ruhl, Reg A. Watson, Marion Gehlen.Global reductions in seafloor biomass in response to climate changeGlobal Change Biology, 2013; DOI:10.1111/gcb.12480

Solution to Cloud Riddle Reveals Hotter Future: Global Temperatures to Rise at Least 4 Degrees C by 2100 (Science Daily)

Dec. 31, 2013 — Global average temperatures will rise at least 4°C by 2100 and potentially more than 8°C by 2200 if carbon dioxide emissions are not reduced according to new research published inNature. Scientists found global climate is more sensitive to carbon dioxide than most previous estimates.

Scientists have revealed the impact of clouds on climate sensitivity. Global average temperatures will rise at least 4 degrees C by 2100 and potentially more than 8 degrees C by 2200 if carbon dioxide emissions are not reduced, according to new research. (Credit: © Maksim Shebeko / Fotolia)

The research also appears to solve one of the great unknowns of climate sensitivity, the role of cloud formation and whether this will have a positive or negative effect on global warming.

“Our research has shown climate models indicating a low temperature response to a doubling of carbon dioxide from preindustrial times are not reproducing the correct processes that lead to cloud formation,” said lead author from the University of New South Wales’ Centre of Excellence for Climate System Science Prof Steven Sherwood.

“When the processes are correct in the climate models the level of climate sensitivity is far higher. Previously, estimates of the sensitivity of global temperature to a doubling of carbon dioxide ranged from 1.5°C to 5°C. This new research takes away the lower end of climate sensitivity estimates, meaning that global average temperatures will increase by 3°C to 5°C with a doubling of carbon dioxide.”

The key to this narrower but much higher estimate can be found in the real world observations around the role of water vapour in cloud formation.

Observations show when water vapour is taken up by the atmosphere through evaporation, the updraughts can either rise to 15 km to form clouds that produce heavy rains or rise just a few kilometres before returning to the surface without forming rain clouds.

When updraughts rise only a few kilometres they reduce total cloud cover because they pull more vapour away from the higher cloud forming regions.

However water vapour is not pulled away from cloud forming regions when only deep 15km updraughts are present.

The researchers found climate models that show a low global temperature response to carbon dioxide do not include enough of this lower-level water vapour process. Instead they simulate nearly all updraughts as rising to 15 km and forming clouds.

When only the deeper updraughts are present in climate models, more clouds form and there is an increased reflection of sunlight. Consequently the global climate in these models becomes less sensitive in its response to atmospheric carbon dioxide.

However, real world observations show this behaviour is wrong.

When the processes in climate models are corrected to match the observations in the real world, the models produce cycles that take water vapour to a wider range of heights in the atmosphere, causing fewer clouds to form as the climate warms.

This increases the amount of sunlight and heat entering the atmosphere and, as a result, increases the sensitivity of our climate to carbon dioxide or any other perturbation.

The result is that when water vapour processes are correctly represented, the sensitivity of the climate to a doubling of carbon dioxide — which will occur in the next 50 years — means we can expect a temperature increase of at least 4°C by 2100.

“Climate sceptics like to criticize climate models for getting things wrong, and we are the first to admit they are not perfect, but what we are finding is that the mistakes are being made by those models which predict less warming, not those that predict more,” said Prof. Sherwood.

“Rises in global average temperatures of this magnitude will have profound impacts on the world and the economies of many countries if we don’t urgently start to curb our emissions.

Journal Reference:

  1. Steven C. Sherwood, Sandrine Bony, Jean-Louis Dufresne.Spread in model climate sensitivity traced to atmospheric convective mixingNature, 2014; 505 (7481): 37 DOI: 10.1038/nature12829

Modern Caterpillars Feed at Higher Temperatures in Response to Climate Change (Science Daily)

Dec. 19, 2013 — Caterpillars of two species of butterflies in Colorado and California have evolved to feed rapidly at higher temperatures and at a broader range of temperatures over the past 40 years, suggesting that they are evolving quickly to cope with a hotter, more variable climate.

A Colias (sulphur) butterfly. (Credit: By Greg Hume (Own work) [CC-BY-SA-3.0], via Wikimedia Commons)

The work, led by Joel Kingsolver at UNC-Chapel Hill, represents a rare instance of how recent climate change affects physiological traits, such as how the body regulates feeding behavior.

“To our knowledge, this is the first instance where we show changes in physiological traits in response to recent climate change,” says Kingsolver, Kenan Distinguished Professor of Biology in UNC’s College of Arts and Sciences, whose work appears today in the journal Functional Ecology.

Caterpillars can eat and grow only when it’s not too cold and not too hot, explains Kingsolver. But when temperatures are ideal, caterpillars eat with reckless abandon and can gain up to 20 percent of their body weight in an hour. That growth determines their ability to survive, how quickly they become adult butterflies and their ultimate reproductive success.

Jessica Higgins, a graduate student in Kingsolver’s lab who spearheaded the study, worked with fellow graduate student Heidi MacLean, Lauren Buckley, currently at the University of Washington, and Kingsolver to compare modern caterpillars to their ancestors from 40 years ago.

Their results show that the two related species of Colias (sulphur) butterflies have adapted in two ways: they not only broadened the range of their ideal feeding temperatures but also shifted their optimal feeding temperature to a higher one.

In their work, the researchers measured changes in climate at the two study sites and then examined changes in how fast caterpillar ate using current and historical data from the 1970s, collected by Kingsolver’s graduate adviser Ward Watt.

Although they found little change in the average air temperature at both study sites, they noticed that the frequency of hot temperatures — that is, temperatures that exceeded 82 degrees Fahrenheit -increased two-fold in Colorado and four-fold in California over the past 40 years.

In response to these temperature fluctuations, modern caterpillars in Colorado ate faster at higher temperatures than their 1970s counterparts. In California, the modern caterpillars ate faster at both high and low temperatures than did their ancestors, but their optimal feeding temperatures did not change.

“These two species of caterpillars adapted to the increased frequency of higher temperatures over 40 years in two different ways, but both are better suited than their ancestors to thrive in a hotter, more variable climate,” says Higgins. “Our climate is changing. The thermal physiology of these species is changing, too.”

Assessing the Impact of Climate Change On a Global Scale (Science Daily)

Dec. 16, 2013 — Thirty research teams in 12 different countries have systematically compared state-of-the-art computer simulations of climate change impact to assess how climate change might influence global drought, water scarcity and river flooding in the future. What they found was:

• The frequency of drought may increase by more than 20 per cent in some regions.

• Without a reduction in global greenhouse-gas emissions, 40 per cent more people are likely to be at risk of absolute water scarcity.

• Increases in river flooding are expected in more than half of the areas investigated.

• Adverse climate change impacts can combine to create global ‘hotspots’ of climate change impacts.

Dr Simon Gosling from the School of Geography at The University of Nottingham co-authored four papers in this unique global collaboration. The results are published this week — Monday 16 December 2013 — in a special feature of the Proceedings of the National Academy of Sciences (PNAS).

For the project — ‘Intersectoral Impact Model Intercomparison Project (ISI-MIP)’ — Dr Gosling contributed simulations of global river flows to help understand how climate change might impact on global droughts, water scarcity and river flooding.

Dr Gosling said: “This research and the feature in PNAS highlights what could happen across several sectors if greenhouse gas emissions aren’t cut soon. It is complementary evidence to a major report I jointly-led with the Met Office that estimated the potential impacts of unabated climate change for 23 countries. Those reports helped major economies commit to take action on climate change that is demanded by the science, at the 17th UN Climate Change Conference of the Parties (COP17) in Durban.”

One of the papers reports a likely increase in the global severity of drought by the end of the century, with the frequency of drought increasing by more than 20 per cent in some regions — South America, Caribbean, and Central and Western Europe.

This in turn has an impact on water scarcity. Another paper co-authored by Dr Gosling shows that without reductions in global greenhouse-gas emissions, 40 per cent more people are likely to be at risk of absolute water scarcity than would be the case without climate change.

Dr Gosling said: “The global-level results are concerning but they hide important regional variations. For example, while some parts of the globe might see substantial increases in available water, such as southern India, western China and parts of Eastern Africa, other parts of the globe see large decreases in available water, including the Mediterranean, Middle East, the southern USA, and southern China.”

Another paper in the PNAS feature found that while river flooding could decrease by the end of the century across about a third of the globe, increases are expected at more than half of the areas investigated, under a high greenhouse gas emissions scenario.

Dr Gosling said: “More water under climate change is not necessarily always a good thing. While it can indeed help alleviate water scarcity assuming you have the infrastructure to store it and distribute it, there is also a risk that any reductions in water scarcity are tempered by an increase in flood hazard.”

The ISI-MIP team describe how adverse climate change impacts like flood hazard, drought, water scarcity, agriculture, ecosystems, and malaria can combine to create global ‘hotspots’ of climate change impacts4. The study is the first to identify hotspots across these sectors while being based on a comprehensive set of computer simulations both for climate change and for the impacts it is causing. The researchers identified the Amazon region, the Mediterranean and East Africa as regions that might experience severe change in multiple sectors.

The findings of the ISI-MIP are amongst the scientific publications that feed into the Intergovernmental Panel on Climate Change (IPCC) Working Group II report on climate change impacts to be presented in March 2014. The IPCC Working Group I report on physical climate science was published in September 2013.

Dr Gosling’s 23-volume report, Climate: observations, projections and impacts, commissioned by the Department of Energy and Climate Change (DECC), which he jointly led with the UK Met Office, addressed an urgent international need for scientific evidence on the impact of climate change to be presented in a consistent format for different countries, particularly those that lack an adequate research infrastructure, to facilitate valid international comparisons. Since COP17, the research has prompted governments to re-consider their options for adapting to climate change.

He said: “I think the results presented in the PNAS special feature have the potential for similar impact.”

Journal Reference:

  1. F. Piontek, C. Muller, T. A. M. Pugh, D. B. Clark, D. Deryng, J. Elliott, F. d. J. Colon Gonzalez, M. Florke, C. Folberth, W. Franssen, K. Frieler, A. D. Friend, S. N. Gosling, D. Hemming, N. Khabarov, H. Kim, M. R. Lomas, Y. Masaki, M. Mengel, A. Morse, K. Neumann, K. Nishina, S. Ostberg, R. Pavlick, A. C. Ruane, J. Schewe, E. Schmid, T. Stacke, Q. Tang, Z. D. Tessler, A. M. Tompkins, L. Warszawski, D. Wisser, H. J. Schellnhuber. Multisectoral climate impact hotspots in a warming worldProceedings of the National Academy of Sciences, 2013; DOI: 10.1073/pnas.1222471110

Drought and Climate Change: An Uncertain Future? (Science Daily)

Dec. 16, 2013 — Drought frequency may increase by more than 20% in some regions of the globe by the end of the 21st century, but it is difficult to be more precise as we don’t know yet how changes in climate will impact on the world’s rivers.

The results come from a study, published in Proceedings of the National Academy of Sciences (PNAS), which examined computer simulations from an ensemble of state of the art global hydrological models driven by the latest projections from five global climate models used for the fifth assessment report of the Intergovernmental Panel on Climate Change.

The research was led by Dr Christel Prudhomme from the UK’s Centre for Ecology & Hydrology working with colleagues from the UK, USA, the Netherlands, Germany and Japan.

Increasing concentrations of greenhouse gases in the atmosphere are widely expected to influence global climate over the coming century. The impact on drought is uncertain because of the complexity of the processes but can be estimated using outputs from an ensemble of global hydrological and climate models.

The new study concluded that an increase in global severity of hydrological drought — essentially the proportion of land under drought conditions — is likely by the end of the 21st century, with systematically greater increases if no climate change mitigation policy is implemented.

Under the ‘business as usual’ scenario (an energy-intensive world due to high population growth and slower rate of technological development), droughts exceeding 40% of analysed land area were projected by nearly half of the simulations carried out. This increase in drought severity has a strong signal to noise ratio at the global scale; this mean we are relatively confident that an increase in drought will happen but we don’t know exactly by how much.

Dr Prudhomme said, “Our study shows that the different representations of terrestrial water cycle processes in global hydrological models are responsible for a much larger uncertainty in the response of hydrological drought to climate change than previously thought. We don’t know how much changed climate patterns will affect the frequency of low flows in rivers.”

One important source of uncertainty depends on whether the models allow plants to adapt to enriched carbon dioxide atmosphere. If this is accounted for, the increase in droughts due to warmer climate and changes in precipitation is mitigated by reduced evaporation from plants, because they are more efficient at capturing carbon during photosynthesis. The process of plant adaptation under an enriched carbon dioxide atmosphere is currently absent from the majority of conceptual hydrological models and only considered on a few land surface and ecology models.

Dr Prudhomme added, “When assessing the impact of climate change on hydrology it is hence critical to consider a diverse range of hydrological models to better capture the uncertainty.”

Journal Reference:

  1. C. Prudhomme, I. Giuntoli, E. L. Robinson, D. B. Clark, N. W. Arnell, R. Dankers, B. M. Fekete, W. Franssen, D. Gerten, S. N. Gosling, S. Hagemann, D. M. Hannah, H. Kim, Y. Masaki, Y. Satoh, T. Stacke, Y. Wada, D. Wisser.Hydrological droughts in the 21st century, hotspots and uncertainties from a global multimodel ensemble experimentProceedings of the National Academy of Sciences, 2013; DOI: 10.1073/pnas.1222473110

Desafios do clima (O Globo)

JC e-mail 4869, de 05 de dezembro de 2013

Artigo de Carlos Rittl* publicado no Globo. Em nosso caso, precisamos deixar de lado discurso de que já fizemos muito e mais que os outros

A 19ª Conferência das Partes da Convenção-Quadro da ONU sobre Mudança do Clima, realizada em Varsóvia, acabou com resultados fracos. Em vez de respostas à emergência climática, países como Japão e Austrália reduziram seus compromissos de corte de emissões de gases de efeito estufa. Venceu o lobby dos que não querem ação, como o setor dos combustíveis fósseis. Perdemos, todos, o recurso mais precioso que temos para resolver o problema, o tempo.

Talvez a única boa nova da COP19 tenha sido a mobilização para a COP20, em Lima, em 2014. O governo do Peru prometeu restabelecer a confiança no processo. A sociedade civil global se mobiliza para cobrar todos os governos em 2014. A COP20 será fundamental: é preciso definir quem vai “pagar a conta” das mudanças climáticas, como pagará (cortes de emissões, financiamento, tecnologia etc.) e quando pagará. E também garantir apoio a países em desenvolvimento, em especial os mais pobres e mais vulneráveis, aos efeitos das mudanças climáticas, de que forma será este apoio e a que tempo.

Em 2014, todos os países precisam apresentar sua proposta de compromisso de redução de emissões para o pós-2020. Em nosso caso, precisamos deixar de lado o discurso de que já fizemos muito e mais do que os outros, que nossa matriz energética é limpa, que reduzimos o desmatamento. Nenhum dos nossos maiores planos de desenvolvimento ou nossa política fiscal e tributária é vinculado a uma lógica econômica baseada em reduções progressivas de emissões de gases de efeito estufa.

O Plano de Expansão da Geração de Energia 2022 prevê mais de R$ 800 bilhões de investimentos em combustíveis fósseis – 72% do investimento total em energia do país. Apenas de 1% a 2% dos recursos do Plano Agrícola e Pecuário anual são investidos em agricultura de baixo carbono. Uso da terra, energia e agropecuária são responsáveis por mais de 90% das nossas emissões, como aponta o Sistema de Estimativas de Emissões de Gases de Efeito Estufa do Observatório do Clima. Com o salto da taxa do desmatamento na Amazônia em 2013, de 28% em relação a 2012 – terceiro maior aumento relativo da taxa já registrado – teremos muito provavelmente todos os setores de nossa economia contribuindo para o aumento das emissões em 2013.

O documento de atualização do Plano Nacional sobre Mudança do Clima, objeto recente de consulta pública, relaciona ações em execução, mas não é nada estratégico, com metas, prazos, orçamento, sistema de monitoramento e avaliação bem definidos.

Para colocar nossa economia no caminho inevitável e estratégico de baixas emissões de carbono no longo prazo, o país tem cumprir o que rege a Política Nacional sobre Mudança do Clima, promover a compatibilização dos princípios, objetivos e diretrizes de todas as políticas e programas governamentais com os desta Política. Ao fim de 2013, estamos longe disso.

*Carlos Rittl é secretário executivo do Observatório do Clima.

(O Globo)
http://oglobo.globo.com/opiniao/desafios-do-clima-10971024#ixzz2mc121Ii6

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JC e-mail 4869, de 05 de dezembro de 2013

Painel afirma que mudanças climáticas trazem risco a curto e longo prazo

Relatório do Conselho Nacional de Pesquisa americano cita possível colapso do gelo no mar polar, uma potencial extinção em massa da vida vegetal e animal, e a ameaça de zonas mortas no oceano

O aquecimento global contínuo representa um risco de mudanças rápidas e drásticas em alguns sistemas humanos e naturais, advertiu nesta terça-feira um painel científico, que cita ainda o possível colapso do gelo no mar polar, uma potencial extinção em massa da vida vegetal e animal, e a ameaça de zonas mortas no oceano.

Ao mesmo tempo, alguns dos piores temores em relação a mudanças climáticas já incorporados ao imaginário popular podem ser descartadas como improváveis, pelo menos durante o próximo século, o painel concluiu. Estes incluem um repentino aumento de liberação de metano dos oceanos ou do Ártico capaz de fritar o planeta, bem como o desligamento da circulação de calor no Oceano Atlântico, que iria resfriar áreas de terras próximas – temor que inspirou o apocalíptico filme “O dia depois de amanhã”, de 2004.

O painel foi nomeado pelo Conselho Nacional de Pesquisa (National Research Council, em inglês), um grupo sem fins lucrativos de Washington que supervisiona estudos sobre as principais questões científicas. Em um relatório divulgado terça-feira, o painel pediu a criação de um sistema que alerte com antecedência a sociedade sobre mudanças capazes de produzir caos. Surpresas climáticas desagradáveis ? já ocorreram, e novas surpresas parecem inevitáveis, talvez dentro de algumas décadas, avisaram os membros do painel. Mas, segundo eles, pouco tem sido feito para se preparar para elas.

– A realidade é que o clima está mudando – disse James WC White, paleoclimatologista da Universidade de Colorado Boulder, que chefiou a comissão sobre os impactos das mudanças climáticas bruscas. – E ele vai continuar mudando, e fazer parte do cotidiano dos séculos vindouros. Talvez até mais do que isso.

A maioria dos cientistas do clima acredita que a liberação de gases do efeito estufa causada pelo homem tem tornado as enormes mudanças na terra inevitáveis, mas também espera que muitas delas evoluam num ritmo lento o suficiente para que a sociedade possa se adaptar.

O documento do painel divulgado terça-feira é o último de uma série de relatórios a considerar a possibilidade de algumas mudanças ocorrem de forma súbita, provocando estresse social ou ambiental, e até mesmo colapso. Como os relatórios anteriores, o novo considera muitas possibilidades potenciais e descarta a maioria delas como improvável – pelo menos a curto prazo. Mas alguns dos riscos são reais, aponta o painel, e em vários casos já aconteceu.

Ele citou o surto de besouros no oeste americano e no Canadá. Sem as noites muito frias no inverno que antes os matavam, os besouros destruíram dezenas de milhões de hectares de florestas. O dano foi tão grave que pode ser visto do espaço.

Da mesma forma, um declínio drástico do gelo marinho de verão ocorreu muito mais rápido no Ártico do que os cientistas esperavam. O painel advertiu que o gelo do mar Ártico pode desaparecer no verão dentro de várias décadas, com impactos severos sobre a vida selvagem e as comunidades humanas na região, além de efeitos desconhecidos para os padrões climáticos do mundo.

Entre os maiores riscos para os próximos anos, o painel prevê um aumento da taxa de extinção de plantas e animais, com as mudanças climáticas provocando a sexta extinção em massa na história da Terra. Muitos dos recifes de coral no mundo, fontes vitais de peixes que servem de alimento para milhões de pessoas, já parecem fadados a desaparecer dentro de algumas décadas.

Outro risco, visto como moderadamente provável no próximo século, é o aumento de calor na parte superior do oceano provocar a redução de oxigênio nas profundezas. No pior dos casos, haveria criação de grandes zonas com muito pouco oxigênio para a sobrevivência das criaturas do mar, com consequências desconhecidas para a ecologia global do oceano, disse o painel.

O relatório considerou a que a possibilidade de um colapso do manto de gelo da Antártica Ocidental, considerada especialmente vulnerável ao aquecimento do oceano, iria acelerar bastante a taxa de aumento do nível do mar. A curto prazo, este risco “desconhecido, mas provavelmente baixo”.

(Justin Gillis, do New York Times/O Globo)
http://oglobo.globo.com/ciencia/revista-amanha/painel-afirma-que-mudancas-climaticas-trazem-risco-curto-longo-prazo-10965038#ixzz2mbqJmetX

Anthropology and the Anthropocene (Anthropology News)

By Anthropology News on December 17, 2013 at 2:44 pm

By Amelia Moore

“The Anthropocene” is a label that is gaining popularity in the natural sciences.  It refers to the pervasive influence of human activities on planetary systems and biogeochemical processes.   Devised by Earth scientists, the term is poised to formally end the Holocene Epoch as the geological categorization for Earth’s recent past, present, and indefinite future.  The term is also poised to become the informal slogan of a revitalized environmental movement that has been plagued by popular indifference in recent years.

Climate change is the most well known manifestation of anthropogenic global change, but it is only one example of an Anthropocene event.  Other examples listed by the Earth sciences include biodiversity loss, changes in planetary nutrient cycling, deforestation, the hole in the ozone layer, fisheries decline, and the spread of invasive species.  This change is said to stem from the growth of the human population and the spread of resource intensive economies since the Industrial Revolution (though the initial boundary marker is in dispute with some scientists arguing for the Post-WWII era and others for the advent of agriculture as the critical tipping point).  Whatever the boundary, the Anthropocene signifies multiple anthropological opportunities.

What stance should we, as anthropologists, take towards the Anthropocene? I argue that there are two (and likely more), equally valid approaches to the Anthropocene: anthropology in the Anthropocene and anthropology of the Anthropocene.  Anthropology in the Anthropocene already exists in the form of climate ethnography and work that documents the lived experience of global environmental change.  Arguably, ethnographies of protected areas and transnational conservation strategies exemplify this field as well.  Anthropology in the Anthropocene is characterized by an active concern for the detrimental affects of anthropogenesis on populations and communities that have been marginalized to bear the brunt of global change impacts or who have been haphazardly caught up in global change solution strategies.  This work is engaged with environmental justice and oriented towards political action.

Anthropology of the Anthropocene is much smaller and less well known than anthropology in the Anthropocene, but it will be no less crucial.  Existing work in this vein includes those who take a critical stance towards climate science and politics as social processes with social consequences.  Beyond deconstruction, these critical scholars investigate what forms scientific and political assemblages create and how they participate in remaking the world anew.  Other existing research in this mode interrogates the idea of biodiversity and the historical and cultural context for the notion of anthropogenesis itself.  In the near future, we will see more work that can enquire into both the sociocultural and socioecological implications and manifestations of Anthropocene discourse, practice and logic.

I have only created cursory sketches of anthropology in the Anthropocene and anthropology of the Anthropocene here.  However, these modes are not at all mutually exclusive, and they should inspire many possibilities for future work.  The centrality of anthropos, the idea of the human, within the logics of the Anthropocene is an invitation for anthropology to renew its engagements with the natural sciences in research collaborations and as the object of research, especially the ecological and Earth sciences.

For starters, we should consider the implications of the Anthropocene idea for our understandings of history and collectivity.  If the natural world is finally gaining recognition within the authoritative sciences as intimately interconnected with human life such that these two worlds cease to be separate arenas of thought and action or take on different salience, then both the Humanities and the natural sciences need to devise more appropriate modes of analysis that can speak to emergent socioecologies.  This has begun in anthropology with some recent works of environmental health studies, political ecology, and multispecies ethnography, but is still in its infancy.

In terms of opportunities for legal and political engagement, the Anthropocene signifies possibilities for reconceptualizing environmentalism, conservation and development.  Anthropologists should be cognizant of new design paradigms and models for organizing socioecological collectives from the urban to the small island to the riparian.  We should also be on the lookout for new political collaborations and publics creating conversations utilizing multiple avenues for communication in the academic realm and beyond.  Emergent asymmetries in local and transnational markets and the formation of new multi-sited assemblages of governance should be of special importance.

In terms of science, the Anthropocene signals new horizons for studying and participating in global change science.  The rise of interdisciplinary socioecology, the biosciences of coupled natural and human complexity, geoengineering and the biotech interest in de-extinction are just a sampling of important transformations in research practices, research objects, and the shifting boundaries between the lab and the field.  Ongoing scientific reorientation will continue to yield new arguments about emergent forms of life that will participate in the creation of future assemblages, publics, and movements.

I would also like to caution against potentially unhelpful uses of the Anthropocene idea.  The term should not become a brand signifying a specific style of anthropological research.  It should not gloss over rigid solidifications of time, space, the human, or life.  We should not celebrate creativity in the Anthropocene while ignoring instances of stark social differentiation and capital accumulation, just as we should not focus on Anthropocene assemblages as only hegemonic in the oppressive sense.   Further, we should be cautious with our utilization of the crisis rhetoric surrounding events in the Anthropocene, recognizing that crisis for some can be turned into multiple forms of opportunity for others.  Finally, we must admit the possibility that the Anthropocene may not succeed in gaining lasting traction through formal designation or popularization, and we should not overstate its significance by assuming its universal acceptance.

In the next year, the Section News Column of the Anthropology and Environment Society will explore news, events, projects, and arguments from colleagues and students experimenting with various framings of the Anthropocene in addition to its regular content.  If you would like to contribute to this column, please contact Amelia Moore at a.moore4@miami.edu.

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ANTHROPOLOGY AND ENVIRONMENT SOCIETY

Big Data and the Science of the Anthropocene

By Anthropology News on December 17, 2013 at 2:44 pm

By Lizzy Hare

In her September Section News Column, “Anthropology and the Anthropocene,” Amelia Moore made a distinction between anthropology in the Anthropocene and anthropology of the Anthropocene. The distinction is made between those who research the effects of global change and those who investigate the concept of the Anthropocene as a social process. My own research related to the Anthropocene is not on the effects of climate change. Rather, it focuses on the process of establishing credibility, authority, and trust through scientific knowledge.  I am following the process of developing an ecosystem forecast model. This model will provide land managers and policy makers with predictions about landscape and vegetation responses to climate change. Following the model’s development serves as an entry point for exploring what counts as credible scientific knowledge about climate change, who gets to decide what counts, and how credibility is determined.  It is fair to describe my research as “anthropology of the Anthropocene.” However, framing it in this way makes it too easy to neglect the generative nature of the Anthropocene as a concept.

As it is used colloquially, the Anthropocene carries heavy connotations of destruction and degradation, and I do not want to discount the serious environmental consequences of global change, or the inequitable distribution of their effects. But the Anthropocene as a concept also has political and technological consequences. Scientists and policymakers who wish to understand, predict, and manage the consequences of this new anthropogenic geological epoch have pushed forward tremendous innovations in science and technology. The Anthropocene is thus not only about unprecedented human impact on the planet, but also about unprecedented changes in technology, such as the rise of global connectivity and computing power that made “Big Data” possible.

“Big Data” typically refers to massive data sets of quantitative data, often originally collected automatically and for non-specific purposes. Big Data’s optimistic supporters claim that they will be able to revolutionize science by using statistics to mine large sets of data rather than tackling each research question with a different set of methods and tools. While Big Data techniques have led to the success of companies like Google, it remains unclear how or even whether automated data collection and statistical analysis can produce more than large-scale correlations. Recently, however, scientists have been working to develop tools for incorporating Big Data with more traditional empirical data by using simulation models. Scientists are developing this technique for use in climate, weather, and ecological forecast models, as a way to reduce uncertainty in forecasts by constraining them with observed data.

Data assimilation is not the only way that modelers have tried to control uncertainties within climate models. Some political leaders have misconstrued climate science, and it has come under intense scrutiny by multiple government committees following the 2009 “Climategate” scandal. The critics of climate science cite the uncertainties inherent in forecasting as well as concerns that scientists with political agendas manipulate data. This specter hangs over US climate science, and one response has been to develop a quantitative scale for uncertainty in forecasts. This move is grounded in the assumption that quantification is an effective technique for neutralizing information, and it displaces concern and politics on to users of the quantitative information. This is especially attractive when trying to convey information as (potentially) dire as the consequences of climate change.

The Anthropocene as a concept asks us to pay attention to changes in the world around us. These changes have environmental, social, and political impacts. In efforts to understand the environmental changes of the Anthropocene, and to respond to changes in political and social order, both anticipated and actualized, scientists have developed new tools and techniques. Many claim that Big Data techniques are revolutionizing science, but it is probably too early to assess that claim. Techniques for assimilating Big Data into climate models are just one example of technological and scientific developments of the Anthropocene. There are certainly many more. The generative potential of this epoch should be a site for ongoing anthropological inquiry because it has the ability to drastically change the world we live in.

The effects of global change—and thus the scope of anthropology in the Anthropocene—will be vast, even more so if we take seriously the impacts that this epoch has had and will have on science and technology. The lived experience of global environmental change is not limited to encounters with environmental catastrophe. New technologies will have consequences for everyone, perhaps especially for those who cannot access them. As anthropologists, we ought to be attentive to what the Anthropocene is capable of producing, not only what it is capable of destroying.

Lizzy Hare is a doctoral student in the department of anthropology at the University of California, Santa Cruz.

Solar Activity Not a Key Cause of Climate Change, Study Shows (Science Daily)

Dec. 22, 2013 — Climate change has not been strongly influenced by variations in heat from the sun, a new scientific study shows.

Solar flare on the sun. Climate change has not been strongly influenced by variations in heat from the sun, a new scientific study shows. (Credit: NASA/SDO/AIA)

The findings overturn a widely held scientific view that lengthy periods of warm and cold weather in the past might have been caused by periodic fluctuations in solar activity.

Research examining the causes of climate change in the northern hemisphere over the past 1000 years has shown that until the year 1800, the key driver of periodic changes in climate was volcanic eruptions. These tend to prevent sunlight reaching Earth, causing cool, drier weather. Since 1900, greenhouse gases have been the primary cause of climate change.

The findings show that periods of low sun activity should not be expected to have a large impact on temperatures on Earth, and are expected to improve scientists’ understanding and help climate forecasting.

Scientists at the University of Edinburgh carried out the study using records of past temperatures constructed with data from tree rings and other historical sources. They compared this data record with computer-based models of past climate, featuring both significant and minor changes in the sun.

They found that their model of weak changes in the sun gave the best correlation with temperature records, indicating that solar activity has had a minimal impact on temperature in the past millennium.

The study, published in Nature GeoScience, was supported by the Natural Environment Research Council.

Dr Andrew Schurer, of the University of Edinburgh’s School of GeoSciences, said: “Until now, the influence of the sun on past climate has been poorly understood. We hope that our new discoveries will help improve our understanding of how temperatures have changed over the past few centuries, and improve predictions for how they might develop in future. Links between the sun and anomalously cold winters in the UK are still being explored.”

Journal Reference:

  1. Andrew P. Schurer, Simon F. B. Tett, Gabriele C. Hegerl.Small influence of solar variability on climate over the past millenniumNature Geoscience, 2013; DOI:10.1038/ngeo2040

Antropólogo francês Bruno Latour fala sobre natureza e política (O Globo)

28.12.2013 | 07h30m

Bruno Latour diz que ‘ecologizar’ é o verbo da vez, mas propõe uma noção de ‘ecologia’ com sentido mais amplo do que o defendido hoje por ativistas e políticos. Para ele, o Brasil, apesar das contradições, é ator fundamental na construção de uma inteligência política e científica para o futuro

Por Fernando Eichenberg, correspondente em Paris

A modernidade é uma falácia, uma ficção inventada para organizar a vida intelectual. Os chamados “modernos” pregam a separação de ciência, política, natureza e cultura, numa teoria distante da realidade do mundo e inadaptada aos desafios impostos neste início de século, acusa o pensador francês Bruno Latour, de 66 anos. “Ecologizar” é verbo da vez, sustenta ele, mas num sentido bem mais amplo do que o espaço compreendido pela ecologia defendida por ativistas e partidos políticos.

— O desenvolvimento da frente de modernização, como se fala de uma frente pioneira na Amazônia, sempre foi, ao contrário, uma extensão de uma quantidade de associações, da marca dos humanos, da intimidade de conexões entre as coisas e as pessoas. A modernidade nunca existiu — dispara Latour, em entrevista ao GLOBO.

Na sua opinião, o Brasil, com todas as suas contradições, é fundamental na possibilidade de um futuro de inovações que gerem um novo tipo de “civilização ecológica”, numa nova “inteligência política e científica”.

Antropólogo, sociólogo e filósofo das ciências, Bruno Latour, que recebeu em maio passado o prestigiado prêmio Holberg de Ciências Humanas, é um dos intelectuais franceses contemporâneos mais traduzidos no exterior. Além de suas originais investigações teóricas, também se aventurou no terreno das artes (com as exposições “Iconoclash” e “Making things public”) e, em outubro, estreou a peça “Gaïa Global Circus”, uma “tragicomédia climática”, que ele espera um dia poder encenar no Jardim Botânico, no Rio. Professor do Instituto de Estudos Políticos de Paris (Sciences-Po), lançou ainda este ano o ensaio “Enquête sur les modes d’existence — Une anthropologie des Modernes” (Investigação sobre os modos de existência – uma antropologia dos Modernos, ed. La Découverte).

Qual a diferença entre “ecologizar” e “modernizar”, segundo seu pensamento?

Modernizar é o argumento que diz que quanto mais nós separamos as questões de natureza e de política, melhor será. Ecologizar é dizer: já que, de fato, não separamos tudo isso, já que a História recente dos humanos na Terra foi o embaraçamento cada vez mais importante das questões de natureza e de sociedade, se é isso que fazemos na prática, então que construamos a política que lhe corresponda em vez de fazer de conta que há uma história subterrânea, aquela das associações, e uma história oficial, que é a de emancipação dos limites da natureza. Ecologizar é um verbo como modernizar, exceto que se trata da prática e não somente da teoria. Mas pode-se dizer “modernidade reflexiva” ou utilizar outros termos. O importante é que haja uma alternativa a modernizar, que não seja arcaica, reacionária. Que seja progressista, mas de uma outra forma, não modernista. Um problema complicado hoje, sobretudo no Brasil. Mas é complicado por todo o lado, na França também. Qualquer dúvida sobre a modernização, se diz que é preciso estancar a frente pioneira, decrescer, voltar ao passado. Isso é impossível. É preciso inovar, descobrir novas formas, e isso se parece com a modernização. Mas é uma modernização que aceita seu passado. E o passado foi uma mistura cada vez mais intensa entre os produtos químicos, as florestas, os peixes, etc. Isso é “ecologizar”. É a instituição da prática e não da teoria.

Qual é a situação e o papel do Brasil neste contexto?

Penso que deve haver uma verdadeira revolução ecológica, não somente no sentido de natureza, e o Brasil é um ator importante. A esperança do mundo repousa muito sobre o Brasil, país com uma enormidade de reservas e de recursos. Se fala muito do movimento da civilização na direção da Ásia, o que não faz muito sentido do ponto de vista ecológico, pois quando se vai a estes países se vê a devastação. Não se pode imaginar uma civilização ecológica vindo da Ásia. No Brasil — e também na Índia — há um pensamento, não simplesmente a força nua, num país em que os problemas ecológicos são colocados em grande escala. Há um verdadeiro pensamento e uma verdadeira arte, o que é muito importante. Se fosse me aposentar, pensaria no Brasil. Brasil e Índia são os dois países nos quais podemos imaginar verdadeiras inovações de civilização, e não simplesmente fazer desenvolvimento sustentável ou reciclagem de lixo. Podem mostrar ao resto do mundo o que a Europa acreditou por muito tempo poder fazer. A Europa ainda poderá colaborar com seu grão de areia, mas não poderá mais inovar muito em termos de construir um quadro de vida, porque em parte já o fez, com cidades ligadas por autoestradas, com belas paisagens e belos museus. Já está feito. Mas numa perspectiva de inventar novas modas e novas formas de existência que nada têm a ver com a economia e a modernização, com a conservação, será preciso muita inteligência política e científica. Não há muitos países que possuem esses recursos. Os Estados Unidos poderiam, mas os perderam há muito tempo, saíram da História quando o presidente George W. Bush disse que o modo de vida dos americanos não era negociável. Brasil e Índia ainda têm essa chance. Mas este é o cenário otimista. O cenário pessimista talvez seja o mais provável.

Qual a hipótese pessimista?

Há os chineses que entram com força no Brasil, por exemplo. Meu amigo Clive Hamilton (pensador australiano) diz que, infelizmente, nada vai acontecer, que se vai fazer uma reengenharia, se vai modernizar numa outra escala e numa outra versão catastrófica. Provavelmente, é o que vai ocorrer, já que não conseguimos decidir nada, e que será preciso ainda assim tomar medidas. Uma hipótese é a de que se vai delegar a Estados ainda mais modernizadores no sentido tradicional e hegemônico a tarefa de reparar a situação por meio de medidas drásticas, sem nada mudar, portanto agravando-a. Mas meu dever é o de ser otimista. Em todo caso, é preciso inventar novas formas para pensar essas questões.

O senhor acompanhou as manifestações de rua no Brasil neste ano que passou?

É uma das razões pelas quais o Brasil é interessante, porque há ao mesmo tempo um dinamismo de invenção política, ligado a outros dinamismos relacionados às ciências, às artes. Há um potencial no Brasil. E há, hoje, uma riqueza. Não são temas que se pode abordar em uma situação de miséria. É preciso algo que se pareça ao bem-estar. Na Índia, se você tem um milhão de pessoas morrendo de fome não pode fazer muito. O Brasil é hoje muito importante para a civilização mundial.

Os partidos ecologistas, na sua opinião, não souberam assimilar estas questões?

Nenhum partido ecologista conseguiu manter uma prática. A ecologia se tornou um domínio, enquanto é uma outra forma de tudo fazer. A ecologia se viu encerrada em um tema, e não é vista como uma outra forma de fazer política. É uma posição bastante difícil. É preciso ao mesmo tempo uma posição revolucionária, pois significa modificar o conjunto dos elementos do sistema de produção. Mas é modificar no nível do detalhe de interconexão de redes técnico-sociais, para as quais não há tradição política. Sabemos o que é imaginar a revolução sem fazê-la, administrar situações estabelecidas melhorando-as, modernizar livrando-se de coisas do passado, mas não sabemos o que é criar um novo sistema de produção inovador, que obriga a tudo mudar, como numa revolução, mas assimilando cada vez mais elementos que estão interconectados. Não há uma tradição política para isso. Não é o socialismo, o liberalismo. E é preciso reconhecer que os partidos verdes, seja na Alemanha, na França, nos EUA não fizeram o trabalho de reflexão intelectual necessária. Como os socialistas, no século XIX, refizeram toda a filosofia, seja marxista ou socialista tradicional, libertária, nas relações com a ciência, na reinvenção da economia. Há uma espécie de ideia de que a questão ecológica era local, e que se podia servir do que chamamos de filosofia da ecologia, que é uma filosofia da natureza, muito impregnada do passado, da conservação. O que é completamente inadaptado a uma revolução desta grandeza. Não podemos criticá-los. Eles tentaram, mas não investiram intelectualmente na escala do problema. Não se deram conta do que quer dizer “ecologizar” em vez de “modernizar”. Imagine o pobre do infeliz responsável pelo transporte público de São Paulo ou de Los Angeles.

A França receberá em 2015 a Conferência Internacional sobre o Clima. Como o senhor avalia esses encontros?

Estamos muito mobilizados aqui na Sciences-Po, porque em 2015 ocorrerá em Paris, e trabalhamos bastante sobre o fracasso da conferência de Copenhague, em 2009. Estamos muito ativos, tanto aqui como no Palácio do Eliseu. Na minha interpretação, o sistema de agregação por nação é demasiado convencional para identificar as verdadeiras linhas de clivagens sobre os combates e as oposições. Cada país é atravessado em seu interior por múltiplas facções, e o sistema de negociação pertence à geopolítica tradicional. E também ainda não admitimos de que se tratam de conflitos políticos importantes. A França aceitou a conferência sem perceber realmente do que se tratava, como um tema político maior. Por quê? Porque ainda não estamos habituados a considerar — e aqui outra diferença entre “ecologizar” e “modernizar” — que as questões de meio ambiente e da natureza são questões de conflito, e não questões que vão nos colocar em acordo. Vocês têm isso no Brasil em relação à Floresta Amazônica. Não é porque se diz “vamos salvar a Floresta Amazônica” que todo mundo vai estar de acordo. Há muita discordância. E isso é muito complicado de entender na mentalidade do que é uma negociação.

Poderá haver avanços em 2015?

Uma das hipóteses que faço para 2015 é a de que é preciso acentuar o caráter conflituoso antes de entrar em negociações. Não começar pela repartição das tarefas, mas admitindo que se está em conflito nas questões da natureza. Os ecologistas têm um pouco a ideia de que no momento em que se fala de natureza e de fatos científicos as pessoas vão se alinhar. Acham que se falar que o atum está desaparecendo os pescadores vão começar a parar de matá-los. Sabe-se há muito tempo que é exatamente o contrário, eles vão rapidamente em busca do último atum. A minha hipótese para 2015 é que se deve tornar visíveis estes conflitos. O que coloca vários problemas de teoria política, de ecologia, de representação, de geografia etc. Talvez 2015 já seja um fracasso como foi 2009. Mas é interessante tentar, talvez seja nossa última chance. Tenho muitas ideias. Faremos um colóquio no Rio de Janeiro em setembro de 2014, organizado por Eduardo Viveiros de Castro, sobre isso. Depois faremos um outro, em Toulouse, para testar os modelos de negociação. Em 2015 faremos um outro aqui na Sciences-Po. A ideia é encontrar alternativas no debate sobre conflitos de mundo. Não é uma questão das pessoas que são a favor do carvão, os que são contra os “climacéticos” etc. Não é a mesma conexão, não é a mesma ciência, não é a mesma confiança na política. São conflitos antropocêntricos. Interessante que as pessoas que assistiram à minha peça de teatro ficaram contentes em ver os conflitos. Na ecologia se faz muita pedagogia, se diz como se deve fazer para salvar a Floresta Amazônica. Mas não se fala muito de conflitos.

Leis para enfrentar mudanças climáticas já foram aprovadas em 15 estados (Jornal da Ciência)

JC e-mail 4877, de 17 de dezembro de 2013

Estudo da USP define Rio de Janeiro como pioneiro no combate às mudanças climáticas

Relatório que será divulgado hoje cita que a cidade, além de obrigar as empresas a reportarem suas emissões de CO2, condiciona o licenciamento ambiental às metas globais e setoriais de emissões e exigir planos de mitigação de gases de efeito estufa das empresas

Quinze dos 27 estados brasileiros estão dando exemplos positivos no combate às mudanças climáticas, estabelecendo regras próprias para reduzir as emissões de gases de efeito estufa. O mesmo não pode ser dito do governo federal, que precisa ser mais cobrado para criar uma agenda capaz de unificar essas iniciativas locais. Esta é a mensagem de um estudo que será divulgado nesta terça-feira em São Paulo pelo Núcleo de Economia Socioambiental da Universidade de São Paulo (USP), o Nesa. O relatório traz elogios específicos ao Rio de Janeiro: cita que o estado “tem se destacado no cenário nacional como pioneiro”.

– Além de obrigar as empresas a reportarem suas emissões de CO2, o Rio vai além: condiciona o licenciamento ambiental às metas globais e setoriais de emissões, além de exigir planos de mitigação de gases de efeito estufa das empresas – conta Juliana Speranza, pesquisadora do Nesa.

O estudo foi preparado em parceria com o Forum Clima, que reúne grandes empresas como Andrade Gutierrez, CSN, Odebrecht, Vale e Natura. A pesquisa cita ainda como boas iniciativas um programa de pagamento por serviços ambientais (PSA) já em vigor no Acre, que tem uma lei que permite a remuneração a quem preserva os serviços ecossistêmicos e a biodiversidade; além da iniciativa do Mato Grosso de criar uma legislação específica para a Redução de Emissões por Desmatamento e Degradação (Redd). São Paulo, embora já obrigue suas empresas a reduzir emissões, ainda não tem projetos tão avançados quanto o carioca.

– O PSA e o Redd aconteceram antes nos estados. A nível nacional, eles ainda estão sendo discutidos. Seria muito melhor se houvesse um envolvimento a nível federal, que desse ao Brasil um programa nacional de mudanças climáticas, interministerial, para unificar toda essa metodologia. Caso contrário, estaremos falando lé com cré – avalia Speranza.

Segundo a pesquisadora, esta harmonização se daria em três frentes: nas políticas estatais entre si; no conjunto delas com a política nacional (criando, por exemplo, um inventário nacional de emissões de gases de efeito estufa), e na adoção do que chama de “postura pública coerente”.

– Você não pode sair reduzindo impostos para estimular o consumo de carros, por exemplo, enquanto sabe-se que os transportes individuais emitem mais CO2. Tem que ter coerência, tem que se criar uma estrutura de governança – opina a pesquisadora.

O relatório vê como positiva iniciativas do Ministério do Meio Ambiente de, até 2015, criar um plano nacional de adaptação às emissões de gases de efeito estufa. E elogia o fato de o país ter conseguido reduzir significativamente o desmatamento, o que deixa o Brasil numa posição confortável até 2020 – mesmo ano em que o Protocolo de Kyoto será revisto. Uma nova ordem mundial frente às mudanças climáticas ocorrerá em 2020. Por enquanto, o Brasil tem apenas um compromisso voluntário com Kyoto, mas esta situação, lembra o estudo, pode mudar.

– O país pode vir a ser obrigado a reduzir metas, num momento em que seu eixo de emissões mudou do desmatamento, que já foi reduzido e cujas metas estão batendo num teto, para a agropecuária e para o setor de energia e de transportes. Ou seja, é preciso pensar para além de 2020 – recomenda Speranza.

(Mariana Timóteo da Costa/ O Globo)
http://oglobo.globo.com/ciencia/estudo-da-usp-define-rio-de-janeiro-como-pioneiro-no-combate-as-mudancas-climaticas-11089052#ixzz2njxCIUU3

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JC e-mail 4877, de 17 de dezembro de 2013

Leis para enfrentar mudanças climáticas já foram aprovadas em 15 estados

As normas antecipam muitos pontos que estão apenas em discussão no plano federal, explica a pesquisadora do Núcleo de Economia Socioambiental da USP, Juliana Speranza, informa a agência Brasil

Leis que definem instrumentos para enfrentar as mudanças climáticas já foram aprovadas em 15 estados brasileiros, mostra a pesquisa O Desafio da Harmonização das Políticas Públicas de Mudanças Climáticas, divulgada hoje (17). As normas antecipam muitos pontos que estão apenas em discussão no plano federal, explica a pesquisadora do Núcleo de Economia Socioambiental da Universidade de São Paulo (USP), Juliana Speranza. “Há avanços, tem uma massa crítica de como se pensa a política, até os instrumentos, marcos regulatórios que são criados, anteriores ao que o governo federal agora vem discutir”, enfatiza.

O levantamento foi lançado pelo Fórum Clima, que reúne o Fórum Amazônia Sustentável, o Instituto Ethos e a União da Indústria de Cana-de-Açúcar (Unica). Entre os destaques da pesquisa estão os estados do Amazonas, Acre e de Mato Grosso, que implementaram sistemas de remuneração para evitar o desmatamento. O Amazonas tem em sua política de mudanças climáticas mecanismos de Redução de Emissões por Desmatamento e Degradação Florestal (Redd+) e de Pagamento por Serviços Ambientais (PSA). Em 2013, o estado de Mato Grosso criou o marco regulatório para o Redd+, enquanto o Acre tem, desde 2010, legislação que prevê o PSA.

“Nos estados da Amazônia, sempre houve uma preocupação com a questão do desmatamento, você tem a sociedade civil ali muito presente e é natural que tenham emergido iniciativas de políticas estaduais”, explica. A pesquisadora lembrou que um programa nacional de PSA, que remunere proprietários de terra por conservar recursos naturais, está sendo discutido no Senado.

As metas de redução de emissões de gases são realidade em São Paulo, no Rio de Janeiro e na Paraíba. Na avaliação de Juliana, ações como essas acabam ajudando o país a diminuir os níveis de poluição. “Se os estados começam a ter uma agenda doméstica, que está gerenciando essas emissões e assumem um compromisso de que lá na frente, em uma data X, tem que reduzir tantos por cento [as emissões], isso ajuda na conta que a gente tem para o Brasil como um todo”, acrescentou.

Além dos efeitos concretos, as políticas estaduais trazem, segundo a pesquisadora, determinados temas para a pauta nacional e também funcionam como experiência prática das medidas. “Os estados têm um universo de instrumentos de políticas públicas que já ocorrem em seu território e agora, em nível federal, você acaba bebendo um pouco na fonte desses estados”.

A especialista chama a atenção, no entanto, para a necessidade de coordenação das ações para obter melhores resultados. “Existe a necessidade de que, em nível nacional, você coordene um pouco as iniciativas, senão cada estado vai fazer da sua forma e você vai ter problemas de harmonização de metodologia, de parâmetros”, destacou Juliana sobre a necessidade de padrões de medidas e normas. A pesquisadora destaca que a falta de uma regulação unificada pode complicar, por exemplo, a situação de empresas que atuam em mais de um estado.

(Daniel Mello/Agência Brasil)

Rapid Evolution of Novel Forms: Environmental Change Triggers Inborn Capacity for Adaptation (Science Daily)

Dec. 12, 2013 — In the classical view of evolution, species experience spontaneous genetic mutations that produce various novel traits — some helpful, some detrimental. Nature then selects for those most beneficial, passing them along to subsequent generations. 

Surface form and cave form of Astyanax mexicanus differ in many morphological traits, the most prominent being the loss of pigmentation and the loss of eyes in the cave forms. (Credit: Courtesy of Nicolas Rohner)

It’s an elegant model. It’s also an extremely time-consuming process likely to fail organisms needing to cope with sudden, potentially life-threatening changes in their environments. Surely some other mechanism could enable more rapid adaptive response. In this week’s edition of the journal Science, a team of researchers from Harvard Medical School and Whitehead Institute report that, at least in the case of one variety of cavefish, that other agent of change is the heat shock protein known as HSP90.

“It’s a very cool story in terms of the speed of evolution,” says Nicolas Rohner, lead author of the Science paper and a postdoctoral researcher in the lab of Harvard Medical School Genetics Professor Clifford Tabin.

Rohner notes that at some point many thousands of years ago, a population of Astyanax mexicanus (a fish indigenous to northeastern Mexico) was swept from its hospitable river home into the unfriendly confines of underwater caves. Facing a dramatically different environment, the fish were forced to adapt. Living in near total darkness, the fish did away with their pigmentation, developed heightened sensory systems to detect changes in water pressure and the presence of prey and, perhaps most strikingly, they lost their eyes. Although seemingly counterintuitive, the loss of eyes is thought to be an “adaptive” or beneficial trait, as the maintenance of a complex but now useless organ would come at a high metabolic cost. Thus, the fish could reallocate their finite physiological resources to biological functions more helpful in the cave setting.

Eye loss in these fish is considered to be a demonstration of an evolutionary concept known as “standing genetic variation,” which argues that pools of genetic mutations — some potentially helpful — exist in a given population but are normally kept silent. The manifestations of these mutations, that is, their impact on observable phenotypes, don’t emerge until the population encounters stressful conditions. But what exactly keeps those mutations at bay?

Enter Whitehead Member Susan Lindquist, whose research has shown that HSP90 silences such genetic variation in a variety of organisms, from fruit flies, to yeast, to plants. Lindquist’s work found that the normally robust cellular reservoir of HSP90 becomes depleted during periods of physiological stress. The loss of HSP90 activity allowed phenotypic changes to emerge quite rapidly. Although some emergent traits found in her lab were not adaptive, some clearly were.

“The delicate balance of protein folding — especially that controlled by HSP90 — holds the key,” says Lindquist, who is also a professor of biology at MIT and an investigator of the Howard Hughes Medical Institute. “Moderate changes in the environment create stresses on protein folding, causing minor changes in the genome to have much larger effects. Because HSP90 governs the folding of the key regulators of growth and development it produces a fulcrum point for evolutionary change.”

Having seen Tabin’s work on the genetics of eye loss in cavefish, she proposed a research collaboration to determine whether HSP90 had been an evolutionary role-player in this vertebrate. The Tabin and Lindquist labs devised a complex set of experiments with cavefish and surface fish of the same species. Surface fish raised in the presence of a drug that blocks HSP90 activity (thereby mimicking a stressful environment) displayed significant variation in eye size — clearly implicating HSP90’s effects on this trait. Conversely, cavefish raised in the same conditions showed no increase in variation in the size of their eye orbits (although the cave fish have no eyes, their skulls retain the orbital cavity where their eyes once were). Intriguingly, however, these fish emerged with small orbits, showing that the genetics governing eye size remains responsive to HSP90.

Although impressive, these findings were chemically induced, leaving open the question of whether such HSP90-related effects would have been seen in nature. To answer this, researchers examined a host of conditions — ranging from pH to oxygen content to temperature — found in the surface and cave waters that are home to these fish. They discovered a considerable difference in conductivity, as measured by salinity, between cave and surface. Because low conductivity, a condition found in the caves, can trigger a heat shock response, they raised surface fish in water whose conductivity equaled that of native caves.

The results were essentially the same: fish raised in conditions of low conductivity showed significant variation in eye size. The scientists had shown that an environmental stressor could have the same effects as the chemical inhibition of HSP90.

“This is the first time that we can see in a natural setting where the stress came from and observe the variation that results,” says Tabin.

Adds Rohner: “This is the first study showing that this HSP90-mediated mechanism can be applied to vertebrates for real morphological adaptive traits.”

For Dan Jarosz, a former postdoctoral researcher in Lindquist’s lab, the study is an important validation of Lindquist’s work on evolution. Jarosz, now Assistant Professor of Chemical and Systems Biology and of Developmental Biology at Stanford University, had been involved in much of Lindquist’s work on HSP90 as a driver of evolution in yeast. He believes this latest work should help quiet those who are skeptical of the impact of this mechanism throughout the plant and animal kingdoms.

“We now have enough evidence to say that large, rapid environmental change can reveal new variation and change the outcomes of real evolution in nature,” he says.

This work is supported by the National Institutes of Health and the Damon Runyon Cancer Research Foundation.

Journal Reference:

  1. N. Rohner, D. F. Jarosz, J. E. Kowalko, M. Yoshizawa, W. R. Jeffery, R. L. Borowsky, S. Lindquist, C. J. Tabin. Cryptic Variation in Morphological Evolution: HSP90 as a Capacitor for Loss of Eyes in CavefishScience, 2013; 342 (6164): 1372 DOI: 10.1126/science.1240276

Países pobres estão 100 anos atrás dos ricos em preparação climática (CarbonoBrasil)

16/12/2013 – 11h52

por Jéssica Lipinski, do CarbonoBrasil

mapa1 Países pobres estão 100 anos atrás dos ricos em preparação climática

Novos dados do Índice de Adaptação Global da Universidade de Notre Dame enfatizam disparidades entre países pobres e o risco em relação à resiliência climática; Brasil aparece em 68º lugar, com classificação considerada média-alta

Um novo relatório publicado por pesquisadores da Universidade de Notre Dame afirma que levará mais de um século para que os países em desenvolvimento atinjam o nível de preparação climática que as nações desenvolvidas já possuem.

Índice de Adaptação Global da Universidade de Notre Dame (ND-GAIN), lançado nesta quinta-feira (12) avaliou 175 países e se foca em questões como a vulnerabilidade das nações às mudanças climáticas, ao aquecimento global e a eventos climáticos extremos, como secas severas, tempestades devastadoras e desastres naturais.

Alguns exemplos de países nessa trajetória de 100 anos incluem o Camboja, o Quênia e o Haiti. “Devido ao recente tufão nas Filipinas, algumas pessoas podem estar se perguntando onde essa nação insular fraqueja em termos de prontidão”, comentou Nitesh Chawla, diretor do Centro Interdisciplinar para Ciência de Rede e Aplicações.

“De acordo com os dados, as Filipinas estão mais de 40 anos atrás dos países mais desenvolvidos em preparação climática. Embora isso seja menor do que os países mais pobres, mostra que as Filipinas ainda tem um longo caminho pela frente”, continuou Chawla.

Já alguns dos países emergentes mais industrializados, como o Brasil, apresentaram uma classificação considerada média-alta, apresentando um nível relativamente satisfatório de resiliência. Nosso país ficou em 68º lugar no geral, sendo classificado em 56º em vulnerabilidade e em 79º em preparação.

“Sabíamos que havia disparidades entre os países mais ricos e mais pobres quando se tratava de adaptação e preparação às mudanças climáticas”, colocou Jessica Hellmann, bióloga da Universidade de Notre Dame.

“Mas não sabíamos que levaria mais de 100 anos para que os países mais pobres atingissem os níveis de preparação que os países mais ricos já alcançaram”, acrescentou ela.

Mas os especialistas que trabalharam no relatório declararam que, de acordo com as pesquisas, nem mesmo os países desenvolvidos são exatamente à prova de mudanças climáticas e do aquecimento global.

Pelo contrário, o documento sugere que, embora eles estejam exercendo esforços para aumentar sua resiliência aos fenômenos naturais e eventos climáticos extremos que acontecem em seus territórios, ainda há espaço para melhorias.

“Esses dados são preocupantes, porque eles evidenciam o quão despreparadas algumas das nações mais vulneráveis realmente estão. Mas eles também mostram que os países mais desenvolvidos não estão fazendo o suficiente, o que levanta sérias questões sobre políticas públicas, não importa quão bem desenvolvida uma economia nacional possa ser”, observou Hellmann.

Os pesquisadores esperam que as descobertas ajudem os líderes mundiais a estabeleceram prioridades globais, regionais e nacionais, assim como estimulem a preparação para as mudanças climáticas.

* Publicado originalmente no site CarbonoBrasil.

Plano Clima: Versão final deve ser apresentada no primeiro trimestre de 2014 (Ministério do Meio Ambiente)

13/12/2013 – 12h16

por Tinna Oliveira, do MMA

klink Plano Clima: Versão final deve ser apresentada no primeiro trimestre de 2014

Klink: propostas da sociedade foram incorporadas. Foto: Martim Garcia/MMA

Reunião presencial marca fim da consulta pública do Plano Clima

A sociedade civil contribuiu, por meio de consulta pública, para a atualização do Plano Nacional sobre Mudança do Clima (Plano Clima), o principal instrumento para a implantação da Política Nacional sobre Mudança do Clima. A consulta pública eletrônica ficou aberta de 25 de setembro a 8 de novembro. Nessa quinta-feira (12) aconteceu a última reunião presencial. Durante o período, qualquer cidadão brasileiro pode oferecer suas contribuições, por meio do formulário disponível na internet. Do total de 27 formulários enviados, foram totalizadas 111 contribuições da consulta pública eletrônica. A versão final do plano revisado deve ser apresentada no primeiro trimestre de 2014.

O Ministério do Meio Ambiente (MMA) é o coordenador do Grupo Executivo (GEx) do Comitê Interministerial sobre Mudança do Clima (CIM). Apresentado em 2008 pelo governo federal, o Plano Clima visa incentivar o desenvolvimento e o aprimoramento das ações de mitigação no Brasil, colaborando com o esforço mundial de redução das emissões de gases de efeito estufa, bem como objetiva a criação das condições internas para lidar com os impactos da mudança global do clima (adaptação).

Avaliação

O secretário de Mudanças Climáticas e Qualidade Ambiental do MMA, Carlos Klink, destacou que a consulta pública permitiu incorporar os avanços que aconteceram no Brasil na questão de mudanças do clima e a suas articulações com a negociação internacional. “Isso mostra o tamanho da ambição que o tema mudanças do clima tem dentro do país, pois não é só uma questão internacional, mas também a sociedade brasileira está muito engajada”, enfatizou.

Klink lembra que existem nove planos para mitigação e já está sendo construído o Plano Nacional de Adaptação, previsto para ser concluído até 2015. O tema de mudanças do clima está em destaque no País. “Estamos nos tornando um exemplo internacionalmente e, aqui no Brasil, está criando raízes muito fortes em todos os setores da sociedade”, explicou. Para o secretário, a governança permite um diálogo para construção e elaboração de todos esses planos, com envolvimento de todos os setores dentro e fora do governo. “O documento reflete esse avanço e mostra de maneira sintética esse tremendo trabalho de coordenação”, salientou.

Etapas

A atualização do Plano Clima passou por várias etapas. Desde janeiro, foram realizadas 17 reuniões do Grupo Executivo e sete reuniões do Fórum Brasileiro de Mudanças Climáticas (FBMC). “O fórum é o canal entre a sociedade e o governo para essa questão clima, por isso a gente sempre estimulou que a sociedade usasse o Fórum nas discussões”, explicou o diretor de Climáticas do MMA, Adriano Santhiago.

Segundo ele, vários setores trouxeram contribuições que foram incorporadas no texto apresentado durante a consulta eletrônica. A contribuição da população foi encerrada nesta reunião presencial, na qual participaram representantes do governo, da academia, do setor produtivo e da sociedade civil. O próximo passo é uma discussão governamental para fechar o documento final.

Em 2009, o Congresso Nacional aprovou a Política Nacional sobre Mudança do Clima, com o ineditismo da adoção de vários compromissos nacionais voluntários de redução de emissões. Além disso, foi criado o Fundo Nacional sobre Mudança do Clima e lançados diversos planos setoriais. Outros pontos que merecem destaque são a redução substancial do desmatamento no país, a mudança do perfil das emissões nacionais de gases de efeito estufa e a transformação substantiva da forma como diversos setores, governamentais ou não, se engajaram no esforço para enfrentar a mudança do clima..

* Publicado originalmente no site Ministério do Meio Ambiente.