Environmental Protection Agency

Last week, the EPA unveiled rules that establish the first national limits on power plant emissions of a host of poisonous airborne pollutants. It's estimated that they'll save the country billions of dollars in health care costs.

The Supreme Court kept up its corporatist streak Monday, handing down two key decisions that were certain to please the Chamber of Commerce. The first helped Wal-Mart quash a massive class action sex discrimination suit; the second stopped states from suing power companies over greenhouse gas emissions.

As the crisis at Japan's Fukushima Daiichi nuclear plant continues, some worry that radiation from the damaged reactors will reach U.S. shores. Dr. Edward Maher, president of the Health Physics Society, and an environmental science expert at Harvard, explains why we should breathe easy.

Chrysler has finally decided to jump on the hybrid bandwagon, announcing Wednesday that it is working with the EPA to develop a hydraulic hybrid powertrain for its vehicles. The system, which stores energy derived from vehicle braking as pressure, could improve fuel economy by 30% to 35%.

The U.S. Air Force and Navy both rank among the top 100 polluters in America, and many of their now-abandoned bases have been declared Superfund sites by the EPA. Here's how two of these bases tackled the toxic stews left behind.

For everyone who wants to know how fuel efficient electric and hybrid cars really compare to gas-powered vehicles, the EPA has released two fuel-economy label proposals that would translate electricity usage into an equivalent in miles per gallon.

Eight states, New York City and three groups won the legal right to sue greenhouse-gas emitting utilities. The companies appealed to the Supreme Court, and the Obama administration has filed a brief supporting them. Find out the implications of this move.

The U.S. will close 20 major bases by September 2011. What happens then depends on the base's location. But the ripple effect is always felt throughout the surrounding area. Often, families lose neighbors, businesses lose customers and workers lose jobs.

Energy Star, the Environmental Protection Agency's (EPA) efficiency-rating program for appliances, is under fire for making dubious claims, mislabeling products, or insufficiently verifying manufacturers' claims.

As the Deepwater Horizon oil spill continues to devastate the Gulf coast fishing industry, worries are growing that contaminated seafood may find its way onto the dinner table. Will crude oil and chemical dispersants infiltrate the food chain for years to come?