"An analysis of Greenland ice core samples indicates significant global methane emissions per capita during the Roman Empire and China's Han Dynasty — much greater than had been known."

"It's lights out for the standard 100-watt incandescent light bulb after new national energy-efficiency laws took effect Monday."

"ST. LOUIS -- Doris Spates was a baby when her father died inexplicably in 1955. She has watched four siblings die of cancer, and she survived cervical cancer. After learning that the Army conducted secret chemical testing in her impoverished St. Louis neighborhood at the height of the Cold War, she wonders if her own government is to blame."

"A standoff between environmentalists in trees and workers clearing the way for a Texas portion of the Keystone XL pipeline has led crews to move around the protesters."

"It is the issue most notable by its absence in the 2012 presidential race. But the environment may yet have an impact this election as campaign groups target the vulnerable congressional seats of Republicans who dismiss the dangers of climate change."

"DENVER -- The deep division between President Barack Obama’s green energy policies and his Republican challenger Mitt Romney’s preference for coal and tar sands oil were apparent in their first presidential debate tonight in Denver."

"Challenged by Obama to explain his plan for the country if he is elected on November 6, Romney replied, 'My plan has five basic parts. One, get us energy independent, North American energy independent. That creates about four million jobs.'