"A group of chemicals called hydrofluorocarbons, long hailed as a substitute for gases that can destroy the ozone layer, are now seen as a growing greenhouse threat given their outsize ability to warm the atmosphere."

The Army has finally agreed to an enforceable timetable for cleaning up Superfund sites at Fort Meade in Maryland.

Tesla Motors' chief executive, whose company has been mired in legal actions, predicted in a blog post that the company would become profitable next month.

An inert ingredient in the popular weedkiller Roundup has been found to kill human cells.

Two brothers are busting levees to return the Ouachita National Wildlife Refuge to its primeval condition.

"The Gulf of Mexico Fishery Management Council ... left in place a moratorium on longline fishing to aid a federally protected sea turtle species."

"The Pentagon and the defense industry is lobbying the White House to prevent U.S. EPA from tightening a health advisory for a rocket-fuel chemical."

Scientists are forecasting that the pollution-caused 'dead zone' in the Gulf of Mexico this summer could be one of the largest on record.

The House climate bill would cost on average $175 per household, the Congressional Budget Office estimated Friday. Maneuvering to get the bill to the House floor continues.

"The administration is defending in court environmental measures that the president once vowed to roll back. Officials say it is part of a long-term plan, but critics see it as backpedaling."