In the state of Pennsylvania's gas drilling boom, newer and unconventional wells leak far more often than older and traditional ones, according to a study of state inspection reports for 41,000 wells.
US President Barack Obama mocked Republicans who reject global warming as a "liberal plot," as he pumped up a crowd of environmental activists in Washington.
Human Rights Watch called Wednesday on the Democratic Republic of Congo to investigate attacks and threats against opponents of a major oil exploration project at one of Africa's oldest national parks.
A whaling fleet anchored at a Japanese port Saturday after Tokyo said it would cancel its annual hunt for the first time in more than 25 years to abide by a UN court ruling.
Coal took center stage in the global warming debate on Monday as a high-profile coal industry event kicked off on the sidelines of a U.N. climate conference in Warsaw.
The snakehead is an invasive species of fish from Asia that is threatening the delicate ecosystem of the Potomac River that flows through Washington into the Atlantic Ocean.
President Barack Obama is running out of time to make good on his lofty vow to confront climate change head-on, and Congress is in no mood to help.
Crews were working Thursday to clean up as much as 30,000 gallons of oil that spilled onto a Minnesota field after a mile-long train derailed.
China's wild finless porpoises are heading toward extinction, a conservation group said Thursday, with the dolphin-like animals now rarer than the giant panda.
A controversial Soviet-era paper mill on the shores of Lake Baikal will be closed down, a government spokeswoman said Thursday, after years of complaints about pollution at the UNESCO-protected Siberian site.