"WASHINGTON/CALGARY -- Canada is running out of time to offer U.S. President Barack Obama a climate change concession that might clinch the controversial Keystone XL oil pipeline, as the country's energy industry continues to resist costly curbs on greenhouse gas emissions."

"PITTSBURGH -- Unions and environmentalists have found one point of agreement in the bitter debate over the natural gas drilling boom: fixing leaky old pipelines that threaten public health and the environment. It's a huge national effort that could cost $82 billion."

"Environmental and industry advocates say a proposed air emissions reporting permit issued last week for BHP Billiton Ltd.'s San Juan Coal Mine in northwestern New Mexico is the first -- or among the first -- ever proposed for a coal mine."

"The Green Climate Fund, designed as the United Nations' most important funding body in the battle on climate change in developing nations, launched its headquarters on Wednesday in South Korea, but uncertainty over finances clouded the event."

"WASHINGTON — More than two dozen of the nation’s biggest corporations, including the five major oil companies, are planning their future growth on the expectation that the government will force them to pay a price for carbon pollution as a way to control global warming."

"Although they rarely come into contact with humans, eight gray wolves on an island in Lake Superior are causing a big headache for the National Park Service."

"A scientist whose observations of drowned polar bears raised alarms about climate change has received $100,000 to settle a whistle-blower complaint against an agency of the Department of the Interior."