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02 Oct 2015: Brown Carbon Plays Larger Role
In Climate Than Assumed, Study Says

Climate models are underestimating the effects of so-called brown carbon from sources such as forest fires because the models

Wood-burning stove
do not account for regional factors — such as areas where wood-burning stoves are common — when estimating brown carbon's climate-warming impacts. Black carbon, primarily from urban combustion sources like vehicles and factories, absorbs the most sunlight, the researchers explain, and it's well-accounted for in climate models. However, most models don't properly account for brown carbon, the researchers say. Brown carbon "can be a significant absorber of sunlight, making it as bad for climate warming as black carbon," said co-author Manvendra Dubey of Los Alamos National Laboratory. The study, published this week in Nature Communications, stresses the differing effects of black and brown carbon on the climate: Solid wood combustion, a source of brown carbon soot, is pervasive during United Kingdom winters, but very uncommon in other study locations, such as Los Angeles, which generally sees more black carbon soot from vehicles.


29 Sep 2015: Electric Buses Could Lead to
Significant Savings Even for Smaller Cities

Electric buses could save a city with half a million residents — one similar in size to Sacramento, California — roughly $12 million each

Electric bus, Bonn, Germany
year if the city's buses were to run on electricity rather than diesel fuel, according to a study by the Volvo Group and the audit and advisory firm KPMG. Factors such as noise, travel time, emissions, energy use, natural resource use, and roughly $2.9 million in avoided health care costs contributed to the annual savings, the analysis says. Gothenburg, Sweden's second-largest city, recently began operating a new electric bus line built by Volvo and powered by wind and hydro electricity, says Niklas Gustafsson, Volvo's head of sustainability. The buses' environmentally friendly design, combined with the fact that they are completely silent and emissions-free, has made the line popular in Gothenburg, he says.


28 Sep 2015: Shell Ends Arctic Oil and Gas
Exploration Bid for Foreseeable Future

Shell Oil has announced that it will stop its controversial exploratory drilling for oil and gas in Arctic waters for the foreseeable

Shell's Polar Pioneer rig as it left Seattle for the Arctic
future, saying in a statement that the reserves it had discovered were not “sufficient to warrant further exploration.” Shell began operating its first exploration well on July 30, 2015, in the Chukchi Sea off the northwestern coast of Alaska. But the company reported that although it had found indications of the presence of oil and gas, the reserves in the basin where they were drilling were, in the words of one company official, "clearly disappointing." Under Shell's federally approved exploration plan, all rigs and support vessels must leave the Chukchi Sea before the end of October. Environmental groups hailed Shell's announcement.


23 Sep 2015: New and Reactivated Coal
Mines Fell to Lowest Levels Ever Recorded

The opening of fewer new coal mines, combined with the closing of less-efficient mines, led to 2013 having the lowest number of active coal mines in the U.S. on record, according to an analysis by the Energy Information Administration. In addition, the number of new and reactivated coal mines that began production in 2013 reached its lowest level in at least the past 10 years, the analysis says. Although 103 mines were added that year (the most recent year for which complete data are available), 271 mines were idled or closed, amounting to a 14-percent decline in the total number of productive coal mines compared to the previous year. The 2013 total was 397 fewer coal mines than in 2008, when U.S. coal production peaked. The declining number of new mines reflects reduced investment in the coal industry, strong competition from natural gas, stagnant electricity demand, a weak coal export market, and regulatory and permitting challenges, the EIA says.


Interview: A Scientist’s View
On How to Repair the Planet

For an environmental scientist who studies how humanity is pushing the earth close to potentially disastrous tipping points, Johan Rockström — author
Johan Rockström
Johan Rockström
of a new book, Big World, Small Planet — is surprisingly optimistic. Although he reckons that our species has crossed four of nine “planetary boundaries,” including those on climate change and deforestation, he believes there is still time to pull back from the brink and create a sustainable future based on renewable energy and a “circular” economy that continually reuses resources. In an interview with Yale Environment 360, Rockström describes how an alignment of science, technological advances, and a growing public hunger for action can get civilization back on track. “It’s not a journey where we are backing into the caves,” says Rockström. “It’s a journey of high technology ... and huge, multiple benefits.”
Read the interview.


16 Sep 2015: Unchecked Consumerism Causing
Record-Breaking Resource Use, Study Says

Consumption of critical global resources — from meat and coffee to fossil fuels and water — has peaked in recent years, accelerating

Cevahir shopping center in Istanbul, Turkey
climate change, pollution, and resource depletion to unsustainable levels, according to an analysis by the Worldwatch Institute. The report tracked 24 global consumption trends and found many of them to be record-breaking. Meat production, for instance, has more than quadrupled in the last 50 years, leading to large-scale pressure on water, feeds, and grazing land. Aquaculture production has increased roughly 10 fold since 1984, and today farmed fish account for nearly half of all fish eaten. Global plastic production has also risen continuously over the past 50 years, while recycling rates remain very low. In the United States, for example, only 9 percent of plastic was recycled in 2012. “Untrammeled consumerism lies at the heart of many of these challenges,” said author Michael Renner.


Forum: What the Pope Should
Say in His Upcoming UN Address

In his June encyclical, Pope Francis issued a call for robust individual action and a sweeping transformation of global economic and
Pope Francis

Pope Francis
political systems to deal with the dual threats of climate change and environmental degradation. On Sept. 25, he will bring aspects of that message to the United Nations. Yale Environment 360 asked leading thinkers on the environment and religion what they would like the pope to say before the U.N. While many said the pope’s encyclical was a potentially transformative moment for stewardship of the planet, others would like Pope Francis to speak out about issues he overlooked or dismissed, including the role of population growth in environmental problems and the vital part that the private sector must play in combating global warming.
Read more.


14 Sep 2015: Global Solar Panel Production
Rate Slowed in Recent Years, Analysis Finds

Solar photovoltaic (PV) manufacturing has been growing at a slower rate in recent years, increasing by only 4 percent

Solar panel manufacturing facility
annually from 2011 to 2013, compared to an average annual growth of 78 percent from 2006 to 2011, says a U.S. Energy Information Administration analysis. Globally, solar PV production facilities are producing far fewer solar panels than their maximum capacity allows, the report says. The peak for that metric occurred in 2011, at 70 percent, when 36.6 gigawatts of solar PV modules were produced globally, while the maximum capacity was 52 gigawatts. The slowdown may be explained by complaints of unfair trade practices originating in China, the EIA says. An investigation found that Chinese solar PV modules were being dumped below cost on the U.S. market, and the U.S. Department of Commerce recently enacted anti-dumping measures on Chinese PV modules. The market is reacting to the slow growth by downsizing workforces and consolidating solar PV manufacturing companies, the analysis says.


09 Sep 2015: Natural Gas Pipeline Updates
Can Cut Greenhouse Gas Leaks by 90 Percent

Pipeline replacement programs in cities can cut natural gas leaks by 90 percent, curbing the release of the powerful greenhouse gas

Detecting natural gas leaks in Times Square, NYC.
methane and boosting public safety, according to a study published in Environmental Science & Technology Letters. Researchers drove cars equipped with sensitive methane-mapping instruments through thousands of miles of city streets in Manhattan, Boston, Cincinnati, Durham, and Washington, D.C. They discovered that Durham and Cincinnati, where public-private partnerships have replaced outdated pipelines, have 90 percent fewer gas leaks per mile than Manhattan, Boston, and Washington, D.C., where hundreds of miles of corroded natural gas pipes date back to the 1800s. Researchers estimate that, in the U.S. alone, $2 billion worth of natural gas was lost to leaks last year.


02 Sep 2015: Alaskan Wind Power Capacity
Increased 20 Fold since 2007, Report Says

Alaska’s wind power capacity increased 20 fold between 2007 and 2014, from 3 megawatts to 60 megawatts, according to an

Pillar Mountain wind farm on Alaska's Kodiak Island
analysis by the U.S. Energy Information Administration. The state, which is known for its vast oil reserves, increased wind power capacity with a blend of utility-scale and distributed, or small-scale, projects. The marked increase is especially notable because Alaska's immense area and sparse population make expanding the grid and adapting it to renewables costly, and the rugged terrain poses unique challenges for installing utility-scale wind farms. In the most remote areas, the cost of building transmission lines is prohibitively high, and in those regions, small-scale and household wind projects bring renewable energy to consumers who once relied on diesel generators. But despite wind power's strong growth, Alaska drew only 3 percent of its energy from wind in 2014.


31 Aug 2015: Researchers Develop Artificial
Leaf That Efficiently Mimics Photosynthesis

Researchers at the California Institute of Technology have developed an artificial leaf that can produce hydrogen fuel through

Artificial leaf device
a process similar to photosynthesis, according to findings published in the journal Energy and Environmental Science. The system is the first complete, efficient, and safe solar-driven device for splitting water to create hydrogen fuels, say the researchers, who have been seeking a cost-effective method for producing energy using only sunlight, water, and carbon dioxide. The new system consists of two electrodes that produce oxygen and hydrogen gases, along with a specialized membrane that keeps the gases separate to prevent the possibility of an explosion. The artificial leaf converts 10 percent of the energy in sunlight into hydrogen fuel and can operate for more than 40 hours continuously, the study says.


27 Aug 2015: NASA Study Quantifies Plants'
Role in Mitigating Urban Heat Island Effect

The presence or scarcity of vegetation is an essential factor in determining how much urban areas heat up, according to a NASA study.


Urban heat island effect
Using data from multiple satellites, the researchers found that areas covered in part by impervious surfaces such as asphalt, concrete, and steel had an average summer temperature 3.4 degrees F higher than nearby rural areas. The highest U.S. urban temperatures compared to surrounding areas were along the Interstate-95 corridor from Boston to Washington and around Atlanta and the I-85 corridor in the Southeast. In desert cities such as Phoenix, the urban area was actually cooler because irrigated lawns and trees provide cooling that dry, rocky areas do not, the researchers explain. The urban heat island effect occurs primarily during the day, when impervious surfaces in cities absorb more sunlight than surrounding vegetated areas.


26 Aug 2015: U.S. Shale Gas Production
Expected to Fall for First Time, Report Says

Natural gas production from all seven major shale formations in the U.S. is projected to drop next month for the first time since


Monthly change in shale gas production
the shale gas boom began in earnest roughly a decade ago, according to an analysis from the U.S. Energy Information Administration. Major shale regions produced gas at a record-high rate of 45.6 billion cubic feet per day in May, but that rate is expected to drop to 44.9 billion cubic feet per day in September, the report says. It attributes the decline to existing, legacy wells becoming significantly less productive and a substantial drop in the number of drilling rigs in each of the seven major shale regions since September 2014. New wells are being established, the EIA notes, but they are not producing enough natural gas to offset expected declines from legacy wells.


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.


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.


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.


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.


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.


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.


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.


16 Jul 2015: Most States Have Curbed
Power Plant Emissions Ahead of EPA Rule

A large majority of U.S. states — 42 of 50 — have already cut power plant carbon emissions ahead of the Environmental Protection Agency's Clean Power Plan, whose rules will be finalized next month, according to an analysis published this week. The plan requires each state to limit emissions from its power plants; to do this, many states have closed coal-fired plants and replaced them with natural gas power plants, which release less carbon dioxide. In fact, the report found, the 42 states that have already lowered power plant carbon emissions did so by an average of 19 percent between 2008 and 2013. The report was conducted by the sustainability advocacy group Ceres, the Natural Resources Defense Council, Bank of America, and four large utilities. “Most parts of the country are firmly on the path toward a clean energy future, but some states and utilities have a longer way to go, and overall the carbon emissions curve is not bending fast enough,” Ceres’ president, Mindy Lubber, said.


13 Jul 2015: Australian Government Curbs
Investments in Wind and Solar Energy

The Australian Clean Energy Finance Corporation (CEFC), a government-funded organization that invests in renewable energy, will no
Australia rooftop solar

Duncan Rawlinson/Flickr
Rooftop solar panels in Western Australia
longer invest in wind technology and small-scale solar projects, the government announced Sunday. Australian Prime Minister Tony Abbott said that the CEFC should invest in new and emerging technologies, and that wind and small-scale solar projects should instead be supported by the free market. Currently, one-third of CEFC funding, which totals roughly $10 billion, goes to solar projects, the majority of which are small-scale. The funding ban could increase prices for small-scale solar projects such as rooftop photovoltaic panel installations, especially for low-income households, renters, and public housing tenants. The ban on these investments is the latest in a series of actions by the Abbott government to make cuts in environmental initiatives, including two failed attempts to abolish the CEFC.


09 Jul 2015: Bird Fatalities at Wind Facilities
Can Be Prevented With New Model, Study Says

The U.S. Geological Survey has developed a new model that it says can help predict and prevent bird fatalities at wind facilities before
golden eagle

Golden eagle
they are even built. The model takes into account three parameters, all of which can be measured before construction: the total footprint of the turbines, avian traffic near the facility, and collision probability. The model used golden eagles as a case study because their soaring and hunting behaviors make them susceptible to turbine collisions. Golden eagles also are long-lived and reproduce relatively late in life, which means wind farm fatalities could have particularly severe population impacts. For two years, the model successfully estimated eagle collisions at a newly constructed wind facility in Wyoming, the researchers say. The model's simplicity "allows wind facility developers to consider ways to reduce bird fatalities without having to collect a complicated set of data," said Leslie New, a researcher at Washington State University, who led the project.


08 Jul 2015: Mountaintop Removal Coal
Mining Has Slowed Significantly, Data Show

Coal production from mountaintop removal mines in the U.S. has declined 62 percent since 2008 — a much steeper drop than the downward

Watch Video
Leveling Appalachia video

Watch the e360 video Leveling Appalachia
trend in overall coal production, the U.S. Energy Information Administration reports. Mountaintop removal (MTR) mines have recently been subjected to additional stringent regulations. For example, MTR operations planning to discard excess rock and soil in streams must now secure extra permits from the Environmental Protection Agency. Tennessee is considering banning some types of MTR mining altogether, and a federal stream protection rule expected to be proposed this summer could place additional limits on the practice. Lower demand for U.S. coal in general can be attributed to competitive natural gas prices, renewable energy growth, flat electricity demand, and environmental regulations, the EIA says.


07 Jul 2015: Self-Driving Taxis Could Spur
Major Cuts in Carbon Emissions, Study Says

By 2030, self-driving electric taxis could cut greenhouse gas emissions from car travel in the U.S. by up to 94 percent, if they were
autonomous taxi

Prototype of a small, self-driving electric taxi
to replace conventional personal vehicles, according to an analysis published in the journal Nature Climate Change. Autonomous taxis are projected to cut carbon emissions primarily through a process known as "right-sizing," or deploying a car that is specifically tailored to match occupancy needs of each particular trip. Right-sizing is cost-effective for both the fleet owner and for passengers, the researchers say, and companies and research groups are currently exploring how to efficiently manufacture small one- and two-seat vehicles. Optimal routing, smoother acceleration and braking, and a cleaner electric grid in 2030 would also contribute to lower carbon emissions. Autonomous taxis are projected to reduce emissions by 63 to 82 percent compared to hybrid cars likely to be on the road in 2030, and by 94 percent over a 2014 gasoline-powered model, the study found.




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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.
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