e360 digest


08 Dec 2014: Latin American and Caribbean
Nations Pledge Major Forest Restorations

Latin American and Caribbean countries yesterday launched Initiative 20x20, an effort to begin restoring

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Forest restoration commitments
20 million hectares of degraded land — an area larger than Uruguay — by 2020. The initiative has secured $365 million in funds, its leaders announced, which will be used to restore forests, avoid deforestation, and improve the use of trees and livestock in agriculture — practices known as agroforestry and silvopasture. This restoration is expected to provide extensive economic, social, and environmental benefits through improved local livelihoods and ecosystem services such as erosion prevention, water purification, and carbon storage, organizers say. Restoration commitments totaling just over 20 million hectares were announced yesterday, with Mexico and Peru making the largest pledges. The initiative was launched in Lima, Peru, alongside international climate talks.
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05 Dec 2014: U.S. Natural Gas Fracking Boom
May Be Shorter Than Predicted, Study Says

Estimates of the amount of natural gas that can be extracted from U.S. reserves is much too high and the boom may last just half as long as predicted, says a new report in the journal Nature. Official government estimates by the Energy Information Administration (EIA) suggest that peak natural gas production, driven by the rapid growth of hydraulic fracturing, will likely last until 2040 before tapering off. The new analysis suggests that that estimate is too high. Instead, researchers say, the peak will likely come in 2020, and after that production will fall off dramatically. The findings are based on higher-resolution, finer-scale estimates of oil and gas reserves — in units of a single square mile — compared to the EIA's method, which lumps together all land within a single county. The EIA's method also fails to account for the realities of economics, the reseachers say: Fracking companies tend to look for "sweet spots," which they quickly abandon as soon as the reserves become depleted and extraction costs rise.
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04 Dec 2014: Arabian Sea Whales Are Earth's
Most Isolated and Endangered Population

Humpback whales inhabiting the Arabian Sea are the most genetically distinct humpback whales and may be

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© Tobias Friedrich
An Arabian Sea humpback
the most isolated population on earth, researchers report. With fewer than 100 estimated individuals, they are "definitely the most endangered" population of humpbacks, said Wildlife Conservation Society researcher Howard Rosenbaum. The Arabian humpbacks' known range is limited to waters near Yemen, Oman, the United Arab Emirates, Iran, Pakistan, and India, and possibly the Maldives and Sri Lanka, researchers say. Genetic data suggest they have remained separate from other humpback whale populations for 70,000 years — extremely unusual in a species famed for annual migrations of 9,000 kilometers or more. The genetic separation is likely reinforced by their breeding schedule, researchers say. While Arabian humpbacks breed on a northern hemisphere schedule, their closest neighbors breed on a southern schedule.
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03 Dec 2014: Public Largely Unaware of Meat
And Dairy's Contribution to Climate Change

The general public has a major lack of understanding of how eating meat and dairy contributes to climate change,

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Perceived vs. actual carbon emissions
according to a survey of Europe, the Americas, Asia, and Africa by the market research organization Ipsos MORI. Although meat and dairy production accounts for roughly 15 percent of total global carbon emissions — equal to exhaust emissions from the international transportation sector — less than 30 percent of survey respondents identified meat and dairy production as a major contributor to climate change. More than twice as many — 64 percent — said transportation was a major contributor. Closing the awareness gap is essential for changing meat and dairy consumption patterns, researchers said, especially in developed nations such as the U.S. Although much of the projected increase in meat and dairy consumption will likely happen in emerging economies, respondents in Brazil, India, and China demonstrated greater consideration of climate change in their food choices and above-average willingness to modify their consumption — an encouraging sign, researchers said.
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02 Dec 2014: New Proposal Outlines
Key Elements for a Global Climate Pact

Coinciding with U.N. climate talks in Lima, Peru, this week, a consortium of policy experts has released a proposal

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Key components of a global climate pact
outlining the key ingredients of a comprehensive climate agreement in Paris next year. Three major components of such a pact, the group said, will be a long-term plan to phase out all greenhouse gas emissions as early as possible in the second half of this century; a long-term goal of reducing the vulnerability and building the resilience of communities facing climate impacts; and establishing five-year cycles for assessing and strengthening nations' actions to cut emissions and adapt to climate change. The proposal stresses "fairness, equity, and justice in climate actions," and suggests different timelines and responsibilities for developed and developing countries. The analysis, from experts at 10 research institutions, is based on interviews with climate negotiators and hundreds of government representatives.
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Five Questions for Gus Speth
On His Environmental Evolution

In a career that has spanned founding major environmental organizations, heading the United Nations
James Gustave Speth
James "Gus" Speth

e360 Five Questions
Development Programme, and serving as dean of the Yale School of Forestry & Environmental Studies, James "Gus" Speth has seen his own ideas about environmental issues change dramatically over the years. Yale Environment 360 asked Speth five questions about his new memoir, Angels by the River; his growing recognition of the global nature of environmental problems; and his dissatisfaction with the state of the environmental movement in the United States.
Read more.
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01 Dec 2014: Politics, Not Extreme Weather,
Shape Climate Perceptions, Study Finds

Climate extremes such as droughts and record temperatures are failing to change people’s minds about global warming, according to a recent study led by Michigan State University sociologists. Instead, political orientation is the most influential factor in shaping perceptions about climate change, both in the short-term and long-term, the researchers found. Some previous studies suggested temperature patterns do influence perceptions about global warming, but none measured climatic conditions as comprehensively as the current research. The study analyzed 50 years of regional climate data and climatic storm-severity measures used by the National Oceanic and Atmospheric Administration from all 50 states, along with 11 years of public opinion data from Gallup polls on climate change perceptions. Although advocates of climate change reduction efforts hope that experience with a changing climate will eventually convince the public of the reality and seriousness of the problem, the current findings do not bode well for that scenario, the researchers say.
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26 Nov 2014: Aerodynamic Upgrades to
Large Trucks Would Cut Fuel Use Steeply

The fuel consumption of the 2 million tractor-trailer trucks hauling cargo across the U.S. — which currently

Airflow patterns around a tractor-trailer truck
burn 36 billion gallons of diesel fuel per year — could be cut by billions of gallons through the use of drag-reducing devices, according to researchers at Lawrence Livermore National Laboratory. In wind tunnel tests, researchers fitted a scale-model truck with two types of devices designed to reduce drag and improve aerodynamics: a trailer skirt, which consists of panels affixed along the lower side edges of a trailer, and a boat tail fairing, which is affixed to the back of the trailer to reduce the size of its wake. The researchers found that using the devices in combination — technology currently installed on only 3 to 4 percent of the nation’s large trucks — reduced the aerodynamic drag by as much as 25 percent, which translates to a 13-percent decrease in fuel consumption. If the U.S. tractor-trailer fleet were to improve its fuel economy by 19 percent, which the researchers say is achievable, 6.5 billion gallons of diesel fuel would be saved each year, avoiding 66 million tons of carbon dioxide emissions.
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25 Nov 2014: China’s Lake Ebinur Has Been
Shrinking Dramatically, NASA Image Shows

As this NASA satellite image shows, Lake Ebinur, located in northwestern China near the border of

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China's Lake Ebinur
Kazakhstan, has shrunk by 50 percent since 1955 as a result of development, agriculture, and natural fluctuations in precipitation. The lake’s saline water is light blue, and the dried lake bed appears white due to salts and other minerals that have been left behind as the water evaporates. The lake’s size fluctuates from year to year due to natural variations in snowmelt and rainfall, and human activity also plays a key role, Chinese researchers say. The nearby city of Bole, with a population of 425,000, consumes significant amounts of water, and farmers irrigate their crops — especially cotton — with water that would otherwise flow into the lake, researchers say. Frequent saline dust storms contribute to desertification, damage soils, harm wetlands, and may be hastening the melting of snow and glaciers downwind, researchers say.
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24 Nov 2014: Record Number of Rhinos Poached In South Africa, Government Says

South African officials have announced that 1,020 rhinos have been killed so far in 2014 — a total that

White rhino in South Africa
surpasses last year’s record slaughter of 1,004 of the endangered animals. Poaching has been on the rise in South Africa, home to the world’s largest population of rhinos, since 2007, when only seven rhinos were killed. The sharp increase is occurring despite steps by the government to improve enforcement and introduce new technologies and intelligence-gathering methods to curb poaching, Mongabay reports. As of 2010, South Africa was home to more than 18,000 white rhinos — over 90 percent of the global population — and nearly 2,000 black rhinos. The animals are being killed for their horns, which are in high demand in China and Vietnam for their supposed, but unproven, medicinal qualities.
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21 Nov 2014: U.S. Can Cut Greenhouse Gas Emissions 80 Percent by 2050, Study Says

The United States can reduce greenhouse gas emissions by 80 percent by 2050, using existing or near-commercial technologies, according to researchers with the Deep Decarbonization Pathways Project. The study analyzed scenarios with four types of decarbonized electricity: renewable energy, nuclear energy, fossil fuel with carbon capture and storage, and a mixed case. The scenarios achieved reductions of 83 percent below 2005 levels and 80 percent below 1990 levels, according to the study, which was released ahead of next month’s climate talks in Lima, Peru, and negotiations in Paris in December 2015. The energy efficiency of buildings, transportation, and industry would need to increase through the use of smart materials and energy-efficient designs, and vehicles will need to be fueled with electricity generated from wind, solar, or nuclear, as opposed to coal, the researchers said. They project the net costs would be on the order of 1 percent of gross domestic product per year. The 80-percent reduction by 2050 is a long-standing goal of the Obama administration, in line with global commitments to limit warming to less than 2 degrees C.
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20 Nov 2014: Real-Time Ocean Acidification
Data Now Available for U.S. Pacific Coast

Researchers, coastal managers, and shellfish farmers along the U.S. Pacific coast can now get real-time ocean

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Web portal for ocean acidification data
acidification data through an online tool developed by the National Oceanic and Atmospheric Administration (NOAA). The data — which includes measurements of pH, carbon dioxide concentrations, salinity, and water temperatures at various sites — should help organizations and businesses make decisions about managing coastal resources and craft adaptation strategies, NOAA researchers say. The tool will feature data from five shellfish hatchery sites along the Pacific coast along with readings from NOAA’s ocean acidification monitoring sites. Ocean acidification is driven primarily by absorption of atmospheric CO2 by ocean waters, which changes seawater chemistry in a way that makes it difficult for many marine organisms to form their shells.
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19 Nov 2014: Global Maritime Shipping
Traffic Has Grown by 300 Percent Since 1992

Maritime traffic has increased four-fold over the past 20 years, causing more water, air, and noise pollution in

Maritime shipping traffic has increased rapidly.
the world's oceans and seas, according to a new study quantifying global shipping traffic. Traffic went up in every ocean during the 20 years of the study, except off the coast of Somalia, where piracy has almost completely halted commercial shipping since 2006. In the Indian Ocean, where the world’s busiest shipping lanes are located, ship traffic grew by more than 300 percent over the 20-year period, according to the report published in the journal Geophysical Research Letters. Burgeoning ship traffic has increased the amount air pollution, particularly above the Sri Lanka-Sumatra-China shipping lane, where researchers recorded a 50-percent increase in nitrogen dioxide, a common air pollutant, over the 20-year period. Shipping is also a major source of noise pollution, which can be harmful to marine mammals, the authors note.
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18 Nov 2014: Social Media Can Help Track Severity of Air Pollution, Researchers Say

Social media posts can help researchers estimate air pollution levels with significant accuracy, according to a team of computer scientists from the University of Wisconsin. The researchers analyzed posts on Weibo — a Twitter-like site that is China's most popular social media outlet — from 108 Chinese cities over 30 days, tracking how often people complained about the air and the words they used to describe air quality. The study showed that the process can provide accurate, real-time information on the air quality index, a widely used measure of common air pollutants. Large Chinese cities sometimes have physical monitoring stations to gauge pollution levels, but smaller cities generally do not because monitors are expensive to install and maintain. The researchers hope these findings will help residents of smaller towns and less affluent areas understand the severity of their local air pollution. Between 350,000 and 500,000 Chinese citizens die prematurely each year because of air pollution, a former Chinese health minister estimated in the journal The Lancet.
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17 Nov 2014: Old-Growth Forest in China
Shrinking Despite Protections, Study Says

China’s anti-logging, conservation, and ecotourism policies are actually accelerating the loss of old-growth forests

Deforestation in China's Yunnan Province.
in one of the country's most ecologically diverse regions, according to a study published in the journal Biological Conservation. Researchers used satellite imagery and statistical analysis to evaluate forest conservation strategies in northwestern Yunnan Province, in southern China. The results show that a logging ban increased total forest cover but accelerated old-growth logging in ancient protected areas known as sacred forests. For centuries, sacred forests have effectively protected old-growth trees from clear-cutting, despite major upheavals in the region’s history. Recent environmental protection policies, however, have shifted management of these areas away from native communities to government agencies — apparently to the forests' detriment, the study shows.
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14 Nov 2014: New Material Can Trap Powerful Greenhouse Gases Efficiently, Chemists Say

Scientists from the U.S. and Taiwan have developed a new type of lightweight, self-assembling molecule that can capture large amounts of potent greenhouse gases,

This porous material traps greenhouse gases.
according to a report in Nature Communications. The molecules create a lightweight structure with many microscopic pores that can adsorb gases such as chlorofluorocarbons (CFCs). Those long-lived compounds, once widely used as refrigerants, were phased out because they damage the ozone layer, but they are still used in various industrial processes. The newly developed material is rich in the element fluorine, which helps it bind CFCs and various other hydro- and fluorocarbon gases very efficiently — to the tune of 75 percent by weight, the chemists say. Although they are less prevalent, the greenhouse effect of those gases can be hundreds- or thousands-fold more powerful than carbon dioxide, the researchers note. Heavier, metal-based materials with similar capabilities have been developed in previous studies, but these were sensitive to water and difficult to process and recycle.
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13 Nov 2014: Global Maps Detail Seasonal and Geographic Trends in Ocean Acidification

A team of scientists has published the most comprehensive analysis yet of how acidity levels vary across the world’s oceans. Drawing on four decades of

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Taro Takahashi
Ocean acidification map
measurements, researchers from Columbia University and the University of Colorado mapped changes in ocean acidity by season and location, as well as how acidity levels affect the stability of shell-building minerals. The maps reveal that the northern Indian Ocean is at least 10 percent more acidic than the Atlantic and Pacific oceans, possibly due to its unique geography, the researchers say. The maps also show that ocean acidity fluctuates most in the colder waters off Siberia, Alaska, Antarctica, and the Pacific Northwest, due to cycles of deep-water upwelling and massive plankton blooms. The oceans have taken up a quarter of the carbon dioxide humans have put in the atmosphere over the last two hundred years, and acid levels at the surface have increased by 30 percent since the beginning of the industrial era, researchers say.
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Interview: Bringing Civility and Diversity to Conservation Debate

For the past few years, an acrimonious debate has been ranging between two camps of conservationists. One faction
“Jane
Jane Lubchenco
advocates protecting nature for its intrinsic value. The other claims that if the degradation of the natural world is to be halted, nature’s fundamental value — what nature can do for us — needs to be stressed. The tone of the rhetoric has led to a petition, published this month in the journal Nature, that criticizes both sides for indulging in ad hominem attacks and unproductive arguments that have devolved into “increasingly vitriolic, personal battles.” In an interview with Yale Environment 360, Jane Lubchenco, former head of the National Oceanic and Atmospheric Administration, explains why she and her co-signatories are calling for a more “inclusive conservation” and why the bickering needs to stop.
Read more.
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12 Nov 2014: U.S. and China Announce
Historic Emissions Reduction Pledges

In what could prove to be a momentum-setting piece of diplomacy, the United States and China — which together account for a third of the planet's greenhouse gas emissions — jointly announced plans to pursue significant cuts in those emissions over the coming 10 to 15 years. Among the details of the joint pledges, unveiled as part of meetings this week between Chinese President Xi Jinping and U.S. President Barack Obama in Beijing, were commitments from the U.S. to cut its CO2 emissions by between 26 percent and 28 percent below 2005 levels by 2025. China, meanwhile, pledged to halt emissions growth by 2030, or earlier, and to increase the nation's share of non-fossil energy sources to roughly 20 percent over the same time frame. The inability of the world's two most consequential economies to agree on an approach to emissions reductions has been a key stumbling block in international climate negotiations for nearly two decades, and the announcement was met with cautious optimism by many climate experts, who characterized it as an important first step toward a global treaty.
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11 Nov 2014: New Mapping Tool Highlights
Carbon-Trapping Forests in Peru

A new, high-resolution mapping technique can be used to help identify and prioritize tracts of forest land with the highest

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Greg Asner
Map of carbon storage potential of land in Peru
carbon-sequestering potential, according to research published in the Proceedings of the National Academy of Sciences. In the study, researchers with the Carnegie Institution for Science applied the technique, which integrated satellite imaging data and advanced, three-dimensional forest mapping information, to the 128 million hectares that comprise the nation of Peru. The analysis considered each landscape's unique climate, topography, geology, and hydrology to produce a map showing a range of landscapes with varying carbon densities — a potentially crucial tool as nations prepare to negotiate global forest protections as part of United Nations climate talks next month Lima, Peru.
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10 Nov 2014: Public Views of Climate Science Hinge on Solutions, New Study Finds

People often evaluate scientific evidence not on the basis of its perceived merits, but on whether they agree with the policy implications of the research, according to a study published in the Journal of Personality and Social Psychology. Using issues like climate change and air pollution as test cases, Duke University researchers sought to determine if what they call a "solution aversion" bias could be detected among self-identified Republican or Democratic survey participants. In one example, participants were provided a scientific assertion that global average temperatures could rise as much as 3.2 degrees by the end of the century, after which they were presented with potential policy solutions. If that solution involved government regulation or increased taxes, just 22 percent of Republican participants expressed confidence in the initial scientific finding. But if the solution emphasized using market forces to curb temperatures, the percentage of Republicans accepting the initial temperature predictions rose to 55 percent. Self-identified Democrats displayed no difference in the same experiment, but liberal biases were clearly elicited on other issues, the researchers found.
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07 Nov 2014: Organized Chinese Crime Behind Tanzania's Elephant Slaughter, Report Says

Chinese-led criminal organizations have been conspiring with corrupt Tanzanian officials to traffic huge amounts

Poached elephant skull in Selous Reserve
of ivory — a trade that has caused half of Tanzania’s elephants to be poached in the past five years — according to a report by the London-based Environmental Investigation Agency. In some cases, Chinese military officials appeared to be complicit in the illegal activities, the report says, and in other instances, prominent Tanzanian businessmen and politicians helped protect ivory traffickers. Tanzania is the largest source of poached ivory in the world, and China is the largest importer of smuggled tusks, according to EIA. Tanzania’s famed Selous Reserve saw its elephant population plunge by 67 percent in four years, from 50,000 animals to 13,000. Tanzania appears to have lost more elephants to poaching during this period than any other country, EIA said.
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06 Nov 2014: Scientists Call For Greater Diversity of Viewpoints on Conservation

In a call to arms published this week in the journal Nature, a group of more than 200 environmental scientists, academics and others involved in the fields of conservation research, policy and advocacy, condemned what they called a lack of diversity within their ranks and the philosophical polarization they say it has engendered. Spearheaded by Heather Tallis, lead scientist at the Nature Conservancy, and Jane Lubchenco, a professor of marine biology at Oregon State University and former head of the National Oceanic and Atmospheric Administration, the commentary argues that a once-spirited but constructive debate between two conservation philosophies — one viewing nature as intrinsically valuable, the other connecting its value with its utility — was now mired in vitriol and acrimony. "We believe that this situation is stifling productive discourse, inhibiting funding and halting progress," the authors wrote, adding that the situation was being made worse because the "dispute has become dominated by only a few voices, nearly all of them men’s."
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05 Nov 2014: Norway Best Prepared Nation
For Climate Change, Global Index Shows

Norway is the best prepared country for climate change, and has been so for almost 20 years, according to

Lofoten, Norway
rankings compiled by the University of Notre Dame. New Zealand, Sweden, Finland, and Denmark rounded out the top five, while Chad, Burundi, Eritrea, Central African Republic, and Congo make up the bottom of the Global Adaptation Index. The rankings highlight the disparities between the world’s relatively wealthy, developed nations and its developing economies when it comes to dealing with climate change. Many of the highest ranking countries do face moderate exposure to climate change, the researchers said, but access to amenities such as electricity, sanitation, clean drinking water, and functional governance have left them better prepared. The economies of many developing countries, however, depend on natural resources, which makes their political and economic stability more susceptible to climate change. The index ranked 178 countries on their vulnerability and readiness to adapt to natural disasters associated with global warming.
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Interview: Saving World’s Oceans Begins With Coastal Communities

Aggressively curbing overfishing, pollution, and development is something coastal communities
“Ayana
Ayana Johnson
can do immediately to protect their ocean resources — and with dramatic results — says marine biologist Ayana Elizabeth Johnson. As the executive director of the Waitt Institute, an ocean conservation organization, Johnson recently put that approach to the test on the Caribbean island of Barbuda. In an interview with Yale Environment 360, she discusses how she helped Barbuda craft rules to protect its ocean resources and why she favors community-driven conservation efforts over more top-down approaches.
Read the interview.
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03 Nov 2014: Climate Impacts To Be Severe and Irreversible Without Emission Cuts, UN Says

Climate change will have “severe, widespread, and irreversible impacts” on society and the environment

The U.N. climate panel's synthesis report was released on November 2.
unless nations swiftly and drastically cut carbon emissions — a goal that, while difficult, still remains within reach, according to a comprehensive new United Nations climate report released this week. Failure to curb emissions by the end of the century will likely lead to food shortages, refugee crises, the flooding of major coastal cities and entire island nations, and dangerous yet routine heat waves, among other impacts, the analysis concluded. But the panel also said for the first time that combating climate change is economically feasible. The new U.N. report synthesizes the findings from a series of analyses released over the past year by the Intergovernmental Panel on Climate Change — the panel's first major update since 2007.
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31 Oct 2014: Giant Galapagos Tortoises Are Making a Strong Comeback, Researchers Say

Giant Galapagos tortoises have made a remarkable comeback over the last five decades, and their

Giant Galapagos tortoise (Chelonoidis hoodensis)
population on the Galapagos island of Española is now secure, according to researchers from the U.S. and Ecuador. Although their global population was down to 15 individuals in the 1960s, after 40 years of captive breeding and reintroduction efforts, the species now numbers roughly 1,000, the study found. About half of the tortoises released on the island since 1975 were still alive in 2007, and they’re now reproducing on their own in the environment. Ecologically, though, the tortoises face some challenges, the study notes. A critical source of food is a native cactus species that was nearly wiped out by feral goats. This likely limits the tortoises' current range, but the reptiles are also aiding the return of the cactus, the scientists say, because they help to spread its seeds.
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30 Oct 2014: China Is Top Developing Nation for Clean Energy Investment, Analysis Finds

China is the most attractive among developing nations for low-carbon investment and deployment, according to an analysis by the Climatescope project, a partnership among various international development agencies and Bloomberg New Energy Finance. China received top marks because it is the largest manufacturer of wind and solar equipment in the world, has the largest demand market for wind and solar energy, and has taken major strides to improve its domestic policy framework score, the analysis said. Brazil ranked second, largely due to the country's aggressive approach to clean energy development and the availability of low-cost capital through its national bank, the report said. South Africa ranked third, and the analysis noted the nation had attracted $10 billion in clean energy investments in 2012 through 2013. The project ranked 55 developing countries on their past, present, and future ability to attract investment for clean energy companies and projects.
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29 Oct 2014: Weather and Climate Key in Weights of Penguin Chicks, Researchers Say

Local weather and large-scale climate trends have the largest impact on the weights of Adélie penguin chicks

An adult Adélie penguin feeds its chick.
— not food availability — according to researchers at the University of Delaware. Adélie penguins are native to the West Antarctic Peninsula, and their habitat is warming faster than most other parts of the planet. Looking at records dating back to 1987, scientists found that year-to-year changes in local weather — including wind speed, temperature, rain, and humidity — could cause chicks’ weights at the time they leave their nests to fluctuate by up to 7 ounces. That’s often the difference between a surviving and non-surviving chick, the researchers say. Biologists previously thought that food sources and parenting played the largest role in chicks’ health, but these findings suggest that exposure to elements is more important. The study "calls into question what happens to an ecosystem when you change climate quickly," principal investigator Matthew Oliver said.
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28 Oct 2014: Scientists Find Seafloor Fallout Plume of Oil from Deepwater Horizon Spill

Researchers say they have found a large fallout plume of oil on the seafloor from the 2010 Deepwater Horizon

Deepwater Horizon oil at the surface of the ocean
disaster in the Gulf of Mexico. According to a report in the Proceedings of the National Academy of Sciences, a portion of the 2 million barrels of oil thought to be trapped in the deep sea after the spill appears to have settled across a 1,250-square-mile patch of the seafloor centered around the Macondo Well, which discharged an estimated 5 million barrels of oil in the nearly three months between its blowout in April and eventual capping in July. The oil is concentrated in the top half-inch of the seafloor, and mostly distributed in patchy deposits to the southwest of the well, the study found. These deposits account for between 4 and 31 percent of the Macondo oil sequestered in the deep ocean, researchers estimate. The rest has likely been deposited outside this area, they say, but has evaded detection so far because of its patchiness.
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