"Aboriginal groups in the Canadian Pacific province of British Columbia said on Thursday they had formed a united front to oppose all exports of crude oil from the Alberta tar sands through their territories."

"The gusts that pummeled the western San Gabriel Valley, including Pasadena and La Cañada-Flintridge, were produced by two separate weather systems that channeled cold air from the north into the L.A. area."

"The Obama administration said Thursday that a series of new air pollution rules for power plants would not cause power shortages, although the expert panel designated by the government to ensure electricity reliability warns that compliance with these rules could strain generating capacity.

"BALTIMORE — An environmental group said Wednesday that infrared video shows air pollution streaming from natural gas sites that have been sprouting up across the Chesapeake Bay watershed."

"CHARLESTON, W.Va. -- CONSOL Energy has signed on to a legal settlement that marks the first time a coal company has agreed to clean up conductivity pollution associated with a valley fill, an environmental group lawyer said Wednesday."

"NEW ORLEANS — Under a new formula announced on Wednesday by Kenneth R. Feinberg, the administrator of the $20 billion fund set up by BP for victims of the 2010 oil spill, shrimp and crab fishermen along the Gulf Coast may be eligible for settlement payments significantly larger than what they were previously offered."

"State oil and gas agencies across the country are straining to prevent a flood of new drilling from harming human health and the environment. But that's not really their job. Or at least not all of it. Their job is also to promote drilling. And sometimes the law makes that their top priority."

"TRAVERSE CITY, Mich. — The Environmental Protection Agency proposed stricter requirements Wednesday for cleaning ballast water that keeps ships upright in rolling seas but enables invasive species to reach U.S. waters, where they have ravaged ecosystems and caused billions of dollars in economic losses."

"Is the U.S. leading or blocking progress toward stopping global warming? It's a key question this week as officials from more than 190 countries begin the latest round of negotiations seeking an eventual global climate-protection plan."