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25 Aug 2015: Endangered Chimp Population
Much Larger Than Estimated, Study Shows

A population of endangered eastern chimpanzees in Uganda is actually significantly larger than scientists had thought, new research

Eastern chimpanzee
from the University of Southern California shows. Using DNA from fecal samples, the scientists estimated the size of the chimp population living in two reserves in western Uganda to be 250 to 320 chimps, divided among at least nine communities, whereas previous estimates had pegged the total at roughly 70. Because the forest they live in is not protected, however, the chimpanzees have been heavily impacted by forest fragmentation, and the fruit trees they rely on are rapidly being cut down, the researchers say. The eastern chimp population that lives in this region is important because it represents the growing status quo for this species, the researchers note — they no longer inhabit unbroken swaths of forest, but instead carve out an existence in shrinking forest patches.


24 Aug 2015: Research Links Amazon
Fires and North American Hurricanes

After studying decades of data on hurricanes, sea surface temperatures, and Amazon fire frequency, researchers have concluded


North Atlantic surface temperatures
that years in which warm North Atlantic waters create powerful hurricanes are followed by periods of drought and fire in the Amazon rainforest. University of California, Irvine scientists say their research has shown that frequent and powerful North Atlantic tropical storms and hurricanes tend to pull a large belt of tropical rainfall to the north, drawing moisture away from the Amazon. The resulting dry spells lead to an increase in severity and duration of fires, which tend to be set in the Amazon by humans clearing land for agriculture. The research is expected to enable meteorologists to better understand seasonal outlooks for drought and fire risk in the Amazon, which could help reduce the extensive rainforest fires that emit large amounts of CO2 into the atmosphere.


21 Aug 2015: Retiring Nuclear Power Plants
Undermines Clean Power Plan, Report Says

If U.S. nuclear power plants are retired early or phased out completely, greenhouse gas emissions could revert back

Salem Nuclear Power Plant in southern New Jersey
to 2005 levels and undermine nearly all progress the power sector has made over the last decade in lowering carbon emissions, according to an analysis by the Washington, D.C.-based think tank Third Way. The group found that retired nuclear plants would predominantly be replaced with natural gas power plants, not renewable energy sources, because renewables would not be able to keep pace with lost nuclear capacity. In fact, retiring any of the nation's 99 nuclear power plants would make it extremely difficult to meet the EPA Clean Power Plan's emissions reductions targets of a 32 percent cut below 2005 levels, the group found. Nuclear power currently provides 20 percent of U.S. electricity and 63 percent of its emissions-free power.


20 Aug 2015: Global Warming Has Worsened
California Drought By Roughly 25 Percent

Rising temperatures driven by climate change have measurably worsened the California drought by increasing evaporation rates and

A Central Valley orchard stricken by the drought.
exacerbating the state's lack of rainfall by up to 27 percent, according to a study from Columbia University's Lamont-Doherty Earth Observatory. While natural weather variations are largely thought to have caused the state's precipitation deficit, rising temperatures appear to be intensifying the situation by driving moisture from plants and soil into the air. The new study is the first to estimate how much worse increasing evaporation rates are making the drought: potentially as much as 27 percent, and most likely 15 to 20 percent worse. Scientists expect higher rainfall levels to resume as soon as this winter, but evaporation will more than overpower any increase in precipitation. This means that by around the 2060s, a drought that is essentially permanent will set in, interrupted only by sporadic rainy years.


Solar Decathlon: The Search for
The Best Carbon-Neutral House

What’s the latest in well-designed, energy-efficient solar homes? The U.S. Department of Energy has invited 15 teams from colleges across the country to design and build affordable, energy-efficient, and attractive solar-powered houses for the 2015 Solar Decathlon. In addition to functioning as comfortable homes, the houses in the competition must produce at least as much energy as they consume. Here, e360 takes a look at some of this year's entries, which will be on display in Irvine, California, this October. These houses have been engineered to not only embrace energy efficiency and sustainable design, but also to meet the diverse needs of their future inhabitants, from food production to storm protection and disaster relief.
View the houses.


19 Aug 2015: Muslim Scholars Issue Call
To End Fossil Fuel Use and Protect Climate

Prominent Muslim scholars have urged world leaders to end the use of fossil fuels and have asked the planet's 1.6 billion Muslims to consider it their religious duty to slow global warming. The declaration was presented this week during the International Islamic Climate Change Symposium in Istanbul. It says that governments of wealthy nations, including oil-producing countries, should be "phasing out their greenhouse gas emissions as early as possible and no later than the middle of the century." The declaration includes harsh criticism of developed nations, which the scholars blame for delaying a comprehensive, global agreement on climate change. “Their reluctance to share in the burden they have imposed on the rest of the human community by their own profligacy is noted with great concern,” the document says. Earlier this year, Pope Francis also issued a major statement calling on world leaders and the 1.2 billion Catholics to take better care of the planet.


18 Aug 2015: How West Antarctica Could Melt
If Greenhouse Emissions Continue to Rise

An international team of scientists has developed the first comprehensive, high-resolution model depicting

View Simulation

Simulation of West Antarctic Ice Sheet retreat
how rapidly the West Antarctic Ice Sheet (WAIS) could melt if greenhouse gas emissions are not brought under control. The study projects that under a high-emissions scenario, the WAIS could lose 80,000 cubic kilometers (19,000 cubic miles) of ice by 2100, increasing sea levels by 8 inches. By 2200, the WAIS could lose 48,000 cubic miles of ice, raising sea levels by a total of 23 inches, the study says. The video shows projected ice loss in the major glaciers feeding into the massive Amundsen Sea Embayment over the next three centuries. The red and orange colors depict the speed of glacial retreat in meters per year. The WAIS is only a fraction of the size of the East Antarctic ice cap, but if the entire WAIS were to melt, global sea levels would rise by roughly 16 feet.


17 Aug 2015: Cost of Distributed Solar Power
Fell for Fifth Straight Year, Report Says

Prices for both residential and non-residential solar energy systems fell in 2014, marking the fifth consecutive year of declining


Distributed solar costs
costs for solar photovoltaic systems, according to an analysis by the U.S. Department of Energy's Lawrence Berkeley National Laboratory. Residential rooftop solar panels in the U.S. cost 40 cents per watt less than the same systems in 2013, and prices for non-residential systems fell by 70 cents per watt. In the first half of this year, costs in a number of large markets fell by an additional 20 to 50 cents per watt, the report says. Photovoltaic equipment costs have remained relatively stable since 2012, so the lower prices are primarily due to reductions in "soft" costs such as marketing, labor, permits, and inspections, analysts say.


14 Aug 2015: Climate Impact of Wasted Meat
Much Larger Than Other Foods, Study Finds

Researchers analyzing food waste at university cafeterias found that, although discarded meats accounted for less waste than fruits and vegetables, they made up the bulk of greenhouse gas emissions associated with food waste. After monitoring four all-you-care-to-eat dining facilities at the University of Missouri, the researchers found that grain products were thrown away most often, followed by fruits, vegetables, beef, and poultry. Diners wasted roughly twice as much bread and cereal by weight than they did meat and eggs; but because protein production is very carbon-intensive, the carbon footprint of wasted meat and eggs was about three times larger than that of all other wasted foods combined. Overall, 16 percent of the cafeterias' food was wasted, leading to roughly 67 tons of greenhouse gas emissions. Of those emissions, discarded beef alone accounted for slightly more than half, the analysis found.


13 Aug 2015: Dangerously Hot and Humid
Days Soon Will Become Regular Occurrences

Climate change will make "danger days" — periods when temperature and humidity push the heat index to 105 degrees F or

View interactive map

'Danger days' by city
higher — much more common over the next 15 years, according to a Climate Central analysis. Looking at 144 U.S. cities, the team determined that only 12 cities have averaged more than one dangerously hot and humid day per year since 1950. By 2030, though, 85 cities — home to nearly one-third of the U.S. population — will likely experience at least 20 danger days each year. That's a dramatic and fast-approaching change from current conditions, the analysts note. Houston, for example, saw only three danger days between 2000 and 2010, but it should expect 102 danger days each year by 2050. The most dramatic increases will be seen in the South, the analysis found. Charleston, West Virginia, is expected to become the most dangerously hot and humid city in the country, experiencing 168 danger days per year by mid-century.


Interview: A Scientist Who Probes
The Rich Inner Lives of Animals

Ecologist Carl Safina has made his name studying and writing about the world’s oceans and the creatures that inhabit them. Now, Safina
Carl Safina with orphaned elephants
Carl Safina
has turned his attention to the fascinating and controversial topic of the inner lives of animals, exploring, as he puts it, “the incredible shimmering world of nuance that many of these creatures experience in their lives with one another.” In an interview with Yale Environment 360 about his recently published book, Beyond Words: What Animals Think and Feel, Safina explains why it’s vital to our own humanity to more deeply empathize with wild creatures and sharply criticizes some research on animal behavior, saying it has led to a flawed understanding of the natural world. “I bristle at the idea that an animal can 'pass a test' administered by human beings,” says Safina. “It’s irrelevant whether the animal corresponds to your concept of something.”
Read the interview.


12 Aug 2015: Warmer Winters Are Leading to
More Wild Boars in Europe, Research Finds

As Europe experiences more mild winters — very likely an effect of climate change, researchers say — the continent's wild boar
wild boar in germany

A young wild boar
populations are growing exponentially, according to research from the University of Veterinary Medicine - Vienna. The scientists identified the trend by comparing up to 150 years of data on annual boar population growth to temperature and precipitation records from 12 European countries. One factor behind the population surges is body-temperature regulation, the scientists say. In mild winters, wild boars need to use less energy to stay warm, leaving more energy for reproduction and piglet rearing. Another factor is bumper crops of the boars' food sources, primarily acorns and beechnuts, which have become increasingly common over the last few decades. Wild boars are more likely to survive harsh winters if they have been preceded by a good year for their food sources, the researchers note.


11 Aug 2015: Cost of Producing Wind Power
Reached a New Low in the U.S. Last Year

The cost of generating wind power in the U.S. fell to its lowest level ever last year, according to a report from the Department of Energy. Utility companies purchased wind power for 2.35 cents per kilowatt-hour on average last year, making the price of wind energy competitive with conventional power sources in many parts of the country. Wind power now meets on average 4.9 percent of the nation's electricity demand, the DOE analysis found, and nine states used wind to produce more than 12 percent of their electricity. Iowa and South Dakota produced more than a quarter of their electricity from wind, Kansas generated roughly 22 percent from wind, and Texas remained the leading state for wind installations in 2014. With a total installed capacity of 66 gigawatts, the U.S. now ranks second only to China in wind power capacity.


10 Aug 2015: Major Algal Blooms Visible Off
Both Coasts of U.S., Satellite Images Show

Major algal blooms have appeared off the Atlantic and Pacific coasts of the U.S. this month, as shown in these NASA


East Coast algal bloom
satellite images. Algae and other forms of phytoplankton are microscopic, plant-like organisms that form the basis of the oceans' food webs. When conditions are right, phytoplankton can reproduce rapidly and bloom to scales that are visible from space. Some blooms are benign — such as the one off the East Coast — and serve as rich feeding grounds for fish and whales. Other blooms, however, can be harmful because they deplete ocean waters of oxygen and sometimes release toxic compounds that poison birds and fish. The West Coast algal bloom contains toxin-producing phytoplankton, and it may be linked to deaths of whales, sea birds, and forage fish, scientists say.


07 Aug 2015: New Zealand Will Shutter Last
Remaining Coal Power Plants, Officials Say

New Zealand will close its last remaining coal plants and rely even more heavily on renewable sources for its electricity needs,
Buller Coalfield in New Zealand

Buller Coalfield, South Island, New Zealand
the country's energy minister announced Thursday. New Zealand already has the fourth-largest share of renewable electricity generation in the world, with roughly 80 percent of its energy needs met by renewables. The final two coal-fired power plants will shut down by December 2018, according to the utility company running the plants, which cited changing market conditions that have made coal power unnecessary in New Zealand. The nation has been using coal to fill gaps in dry years, when hydropower could not meet the grid's demand. But recent investments in wind and, particularly, geothermal energy have made that stopgap measure unnecessary, the energy minister said. The country has pledged ahead of the Paris climate summit to cut emissions to 30 percent below 2005 levels by 2030.


06 Aug 2015: Mimicking Butterfly Wings Can
Improve Efficiency of Solar Energy Systems

Solar-concentrating photovoltaic systems can produce nearly 50 percent more power by mimicking the V-shaped wing
cabbage white butterfly

Cabbage white butterfly
formation certain butterflies exhibit before take-off, say researchers at the University of Exeter. The cabbage white butterfly warms its muscles before flight by placing its wings in the shape of a "V" to maximize the concentration of solar energy onto its thorax. This behavior, known as reflectance basking, increases the butterfly's thorax temperature by roughly 13 degrees F compared to flat wings, the researchers found. When reflective panels are arranged around a concentrating photovoltaic system in the same way, this wing-like configuration increases the power-to-weight ratio of the solar energy system by 17-fold, making it vastly more efficient, the researchers explain in the journal Scientific Reports. The team showed that replicating the single layer of highly reflective scale cells found in the butterfly wings could also improve power-to-weight ratios of solar concentrators.


05 Aug 2015: Emissions From U.S. Power
Plants Reached 27-Year Low, Report Says

Electric power plants in the U.S. emitted less carbon dioxide in April than they have in any month since April 1988 — a 27-year low — according to an analysis by the Energy Information Administration. The report said the electric power sector has made major strides in improving efficiency and lowering its carbon footprint, producing significantly more electricity while lowering CO2 emissions. Renewable energy production has more than doubled since 1988, the use of natural gas to produce electricity has more than tripled, and coal consumption has decreased by 17 percent, the EIA report says. Natural gas plants are now about 25 to 30 percent more efficient than coal plants in terms of power generation, and they emit 71 to 79 percent less carbon dioxide than coal plants.


04 Aug 2015: Study Finds Glaciers Melting
At Unprecidented Rates Around the Globe

Glaciers around the globe are melting at unprecedented rates, according to an analysis of data spanning 120 years by researchers at


Rhone Glacier in Switzerland
the University of Zurich. The team compared glacier data collected between 2001 and 2010 with measurements, aerial and satellite photos, written accounts, and historical depictions from the previous century. On average, glaciers are currently losing between 0.5 and 1 meter of ice thickness each year, the researchers found — two to three times more than glaciers were losing on average in the 20th century. Although the team analyzed exact measurements from a few hundred glaciers, they say that field- and satellite-based observations of tens of thousands of glaciers around the world confirm their findings on a much larger scale. Intense ice loss over the past two decades has made glaciers unstable in many regions, the researchers say, and these glaciers will suffer further ice loss, even if the climate stabilizes.


03 Aug 2015: California Has Missed Equivalent
Of Full Year of Rain in Ongoing Drought

Over the past three years of severe drought, California has accumulated a rain "debt" equal to a year's worth of precipitation, NASA


Drought conditions in the U.S. West
researchers report in the Journal of Geophysical Research — Atmospheres. The state is roughly 20 inches behind in total precipitation, the scientists calculate, which is the average amount expected to fall in the state in a single year. The deficit has been driven primarily by a lack of extreme precipitation events known as atmospheric rivers — water vapor-rich air currents that move inland from the Pacific Ocean — which, in an average year, provide 20 to 50 percent of California's precipitation. The researchers found that California also had a 27.5-inch precipitation deficit between 1986 and 1994. However, the state's population, industries, agriculture, and water demand have grown significantly since that time.


31 Jul 2015: Severe Droughts Affect Forests
And CO2 Storage for Years, Study Shows

Severe drought can affect a forest's growth for up to four years, a period during which it is less effective at removing carbon
Times Square ivory crush

A stressed forest in the southwestern United States
from the atmosphere, a new study reports in the journal Science. Standard climate models have assumed that forests and other vegetation bounce back quickly from extreme drought, but that assumption is far off the mark, the researchers say. Looking at data from more than 1,300 forest sites dating back to 1948, they found that living trees took an average of two to four years to recover and resume normal growth rates after droughts ended. Frequent droughts in places like the western U.S. could significantly impact the ability of forests to sequester carbon, the study found. Researchers aren't sure how drought causes these long-lasting changes, but they say there are likely three causes: Loss of carbohydrate and foliage reserves may impair growth; pests and diseases may accumulate in drought-stressed trees; and lasting damage to vascular tissues impairs water transport.


Gallery: The Wild Lands at Stake
If Alaska’s Pebble Mine Proceeds

The proposed Pebble Mine in southwestern Alaska is a project of almost unfathomable scale. If the copper- and gold-mining project proceeds, the mine would cover 28 square miles and require the construction of the world’s largest earthen dam — 700 feet high and several miles long — to hold back a 10-square-mile containment pond filled with up to 2.5 billion tons of sulfide-laden mine waste. All this would be built not only in an active seismic region, but also in one of the most unspoiled and breathtaking places on the planet — the headwaters of Bristol Bay, home to the world’s most productive salmon fishery. In a photo essay, landscape photographer Robert Glenn Ketchum documents the lands and waters at risk from the project, whose fate is currently wending its way through the courts.
Read more | View gallery


29 Jul 2015: Global Population Projected to
Reach 11 Billion by 2100, U.N. Estimates

The current world population of 7.3 billion is expected to reach 8.5 billion by 2030, 9.7 billion by 2050, and 11.2 billion in 2100,


Global fertility rates
according to a United Nations report released today. The revised U.N. estimates counter previous projections, which had said that global population would peak at roughly 9 billion by 2050, then gradually decline. Most growth will occur in developing regions, the new report says, especially Africa, which is expected to account for more than half of the world’s population growth between 2015 and 2050. India is expected to become the most populous country, surpassing China around 2022. Nigeria could surpass the United States by 2050, which would make it the third-largest country in the world, the United Nations projects.


28 Jul 2015: Roughly 40 Percent of World
Unaware of Climate Change, Survey Says

Roughly 40 percent of adults worldwide have never heard of climate change, according to an analysis of global climate change awareness and risk perception published in Nature Climate Change. The percentage of people unaware of climate change rises to more than 65 percent in developing countries such as Egypt, Bangladesh, and India, whereas only 10 percent of the public is unaware in North America, Europe, and Japan. The findings indicate that strategies for securing public engagement in climate issues will vary from country to country, the researchers say, because different populations perceive climate-related risks very differently. In many African and Asian countries, for example, climate risk is most strongly perceived through noticeable changes in local temperatures. "The contrast between developed and developing countries was striking," said Anthony Leiserowitz, director of the Yale Program on Climate Change Communication and co-author of the study.


27 Jul 2015: President Obama Announces
Major New Limits on Interstate Ivory Trade

President Obama has announced strict new limits aimed at stemming the global ivory trade which, when implemented,
Times Square ivory crush

FWS crushed illegal ivory trinkets in Times Square.
would nearly ban all ivory trade within the United States. The measures also include new restrictions on when ivory can be exported to other countries. “We’re proposing a new rule that bans the sale of virtually all ivory across state lines,” Obama said at a press conference in Kenya on Saturday. Current laws in the U.S. are aimed at controlling the import and export of ivory, while allowing some legal trade among states — a loophole that many illegal ivory dealers have used to their advantage. The new regulation, expected to be finalized later this year, would restrict ivory trade between states to items that are over 100 years old or contain only very small amounts of ivory. The U.S. is estimated to be the world's second largest ivory market, with sales outpacing all nations except China.


24 Jul 2015: European Union Is Increasingly
Turning to Wind Power, Analysis Finds

The European Union met 8 percent of its electricity demand with wind power last year, up from roughly 7 percent in 2012,
North Sea wind farm

Wind farm off the coast of the Netherlands
according to a report by the Joint Research Center, the European Commission's in-house science service. That's equal to the combined total electricity consumption of Belgium, Ireland, Greece, and the Netherlands, the report notes, and it is a heartening sign for the E.U. wind power sector, which had seen turbine installations decline in 2013. Denmark generated enough wind power to meet 40 percent of its electricity demand, and in Ireland, Portugal, and Spain, wind's share made up between 19 and 25 percent of final consumption. Fifteen other E.U. nations generated 4 percent or more of their electricity from wind. By 2020, wind energy will provide at least 12 percent of Europe's electricity, the analysis says. Globally, wind power has grown dramatically over the last two decades, soaring from 3.5 gigawatts in 1994 to roughly 370 gigawatts by the end of 2014.


23 Jul 2015: Synthetic Coral Could Remove
Mercury Pollution From Ocean, Study Finds

Chinese researchers have constructed a type of synthetic coral that could help remove toxic heavy metals like mercury from
synthetic coral mercury

Microscope image of the coral-like structure
the ocean, according to a report in the Journal of Colloid and Interface Science. Mercury can be especially toxic to corals because they very efficiently adsorb heavy metals, the scientists note. They took advantage of that ability to create a synthetic coral that can bind and remove mercury pollution in water. The coral-like structure is covered with self-curling nanoplates made of aluminum oxide — a chemical compound that can collect heavy metals. The scientists found that the synthetic coral structure could bind mercury 2.5 times more efficiently than aluminum oxide particles alone. According to the World Health Organization, up to 17 in every thousand children living in areas relying on subsistence fishing showed cognitive declines caused by eating mercury-contaminated fish.


With Camera Drones, New Tool
For Viewing and Saving Nature

In a career spanning four decades, award-winning filmmaker Thomas Lennon has tackled topics as diverse as the Irish in America and a polluting chemical plant in China. But it was his current project — a short film about the Delaware River — that opened his eyes to what he sees as a revolutionary new tool for viewing the natural world: the camera drone. In an interview with Yale Environment 360, Lennon — who produced a video of drone images from the Delaware for e360 — describes how drones are a major innovation that allows filmmakers to capture images from vantage points never before possible. “There’s an opportunity for visual excitement, but combined — and this is the key — with intimacy,” Lennon says. “And I think that can become a tool for artists as well as for environmentalists.”
Watch video | Read interview


22 Jul 2015: Algae Could Be Environmentally
Friendly Livestock Feed, Research Finds

Algae could replace corn as feed for cattle and other livestock, according to findings published in the Journal of Animal Science. Algae — hardy
algae cattle feed

Algae-based cattle feed
microorganisms that can grow in a variety of environments and laboratory settings — require less fertilizer, water, land, and herbicides than corn, and thus could prove to be an environmentally friendly alternative for livestock feed, researchers say. The materials used in the new study were remnants of algae grown and processed for other applications, such as cosmetics, cooking oil, and biofuels, and would otherwise have been burned as waste. The researchers found that even these pre-processed leftovers were able to provide the same amount of protein as corn, along with slightly more fat. Cattle in the study readily ate the algae at a variety of concentrations and maintained their body weight as well as corn-fed cattle. Researchers say the algal meal could be priced to compete with corn and could be on the market by 2016.


21 Jul 2015: California Almonds Have
Smaller Climate Impact Than Many Foods

California almonds could become carbon-neutral or even carbon-negative if growers were to make full use of practices such
almonds in orchard

Almonds growing in an orchard
as shell, hull, and biomass recycling, according to new research in the Journal of Industrial Ecology. Eighty percent of the world's almonds come from the drought-stricken state, and production operations there have drawn much ire since studies showed that almonds are a particularly water-intensive crop. However, the new research shows that the energy and greenhouse gas footprints of almonds can be lessened by, for example, using shells, hulls, and orchard biomass to generate electricity or feed dairy cows. "Our research shows 1 kilogram of California almonds typically results in less than 1 kilogram of CO2 emissions," said author Alissa Kendall, which is "a lower carbon footprint than many other nutrient- and energy-dense foods."


20 Jul 2015: Nuclear Rush Will Make China
Third-Largest Nuclear Generator by 2020

With dozens of nuclear power plants planned or under construction, China will soon surpass South Korea, Russia, and Japan in


Nuclear generating capacities
nuclear generating capacity, the U.S. Energy Information Administration reports. Nuclear power currently makes up slightly more than 2 percent of the country's total power generation, but the Chinese government has a goal of generating at least 15 percent of the nation's energy using non-fossil fuel sources by 2020. To help achieve this target, China plans to increase nuclear capacity to 58 gigawatts — more than doubling its current 23-gigawatt capacity — and to have an additional 30 gigawatts under construction by 2020. By the end of 2015, China is expected to surpass South Korea and Russia in nuclear generating capacity, and by 2020, it will generate more nuclear power than all nations except the U.S. and France. All of China's nuclear plants are located along the east coast and in southern parts of the country, near the country's most populous areas, but China has increasingly considered constructing reactors farther inland following the 2011 Fukushima disaster.




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Photographer Robert Wintner documents the exquisite beauty and biodiversity of Cuba’s unspoiled coral reefs.
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Warriors of Qiugang
The Warriors of Qiugang, a Yale Environment 360 video, chronicles a Chinese village’s fight against a polluting chemical plant. It was nominated for a 2011 Academy Award for Best Documentary Short.
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A three-part series Tainted Harvest looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup.
Read the series.