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The White House has announced a new plan to reduce America's methane emissions, which are thought to account for up to 14% of the country's total greenhouse emissions. The Environmental Protection Agency will monitor methane emissions from the fossil-fuel sector, and the Interior Department will develop a plan to capture and sell methane emitted by coal mines on federal land. The effort will depend on "cost-effective, voluntary actions and common-sense standards," said Dan Utech, special assistant to the president for energy and climate change

Mountaintop-removal mining is changing water chemistry and harming fish stocks in the Appalachians, federal researchers say. "We're seeing significant reductions in the number of fish species and total abundance of fish downstream from mining operations," says biologist Nathaniel Hitt.

President Barack Obama is pushing American companies to abandon the use of a chemical coolant called R-134a in refrigerators, air conditioning systems and other industrial applications. R-134a is in a class of chemicals that can be up to 10,000 times as powerful a greenhouse gas per ounce as carbon dioxide.

By the end of the century, scientists say, megafires-conflagrations that chew up at least 100,000 acres of land-will become the norm. Which makes them of critical interest to researchers. These infernos, once rare, are growing to sizes that U.S. Forest Service Chief Tom Tidwell describes as "unimaginable" two decades ago. Five alone have consumed more than five million acres in central Alaska since June. Washington, Oregon, California, Arizona, New Mexico and Colorado also experienced their worst wildfires in the past seven years.

Rising temperatures are increasing the number of "megafires" in the forests of the western U.S., experts say. Tackling and preventing such fires could require a significant shift in firefighting and forest conservation strategies. "These stresses are going to become more widespread," warned Craig Allen, a U.S. Geological Service forest ecologist. National Geographic News (free registration) (8/9) 

Scientists have developed a technique that could pull the mounting carbon dioxide in our atmosphere and transform it into carbon nanofibers, resulting in raw materials for use in anything from sports gear to commercial airliners.

More than half of Earth's 37 largest aquifers are being depleted, according to gravitational data from the GRACE satellite system.

More than half of the world's 37 biggest aquifers are running dry, putting at risk the freshwater supplies of hundreds of millions of people, according to a NASA analysis. "The water table is dropping all over the world," said NASA water scientist Jay Famiglietti. 

European climate policies are creating new demand for biomass, which power plants now have an incentive to burn instead of coal. That's leading to dramatically increased logging along the eastern coast of the U.S., even as researchers question the eco-friendliness of biomass-based power generation

The best climate scientists in the world are telling us that extreme weather events like hurricanes are likely to become more powerful.  When you combine stronger storms with rising seas, that's a recipe for more devastating floods.

In a sweeping initiative to curb pollutants blamed for global warming, the Obama administration unveiled a plan Monday aimed at cutting carbon dioxide emissions from power plants by nearly a third by 2030.

Since 2007, the World Wildlife Fund and Coca-Cola have jointly raised tens of millions of dollars for water conservation projects. The partnership proved a winner for both organizations, write E. Richard Brownlee and Allison Elias. "What began as a relationship full of risk and uncertainty grew into a robust partnership built on trust at all levels of the organizations," they explain

The Hershey Company announced plans to switch some of its popular chocolate products to "simpler ingredients," which includes a transition to non-GMO ingredients in its Hershey's milk chocolate bars and Hershey's kisses by the end of 2015.

China's latest clean air provision includes the outright banning of all usage and sales of coal in Beijing by the end of 2020.

A committee of the International Civil Aviation Organization has proposed standards for aircraft carbon dioxide emissions. "When fully implemented, the standards are expected to reduce carbon emissions more than 650 million tons between 2020 and 2040, equivalent to removing over 140 million cars from the road for a year," the White House said in a fact sheet

New research suggests that millions of Americans currently live in regions that would be inundated by rising oceans if global temperatures continue to rise. The major remaining question isn't whether such change is coming, but rather how quickly it will come, says researcher Benjamin Strauss. "The question is, how long is the fuse and has it been lit yet?" he says. 

China recently pledged to max out its carbon emissions by 2030 -- but some researchers say the country's carbon output might already have peaked. "We're reaching a point in much of China where the cities have been built, the roads have been built, a lot of the demand for cement and steel is essentially slowing," explained energy researcher Joanna Lewis.

As President Donald Trump announced plans to withdraw from the Paris climate agreement, several governors and mayors of major cities reacted with disappointment and pledges to continue environmental efforts. "Worldwide, cities will lead in achieving climate treaty goals because so much of what's required happens at the local level," said Austin, Texas, Mayor Steve Adler.

Producing the meat that goes into US pet foods results in 64 million tons of greenhouse gases each year, according UCLA's Gregory Okin. The geographer's newly published study encourages less-meaty or plant-based pet foods.