"Of all the global warming gasses, methane is one of the very worst. Pound for pound, the Environmental Protection Agency says its effect on global warming is 20 times greater than that of carbon dioxide. And though its lifetime in the atmosphere is substantially shorter than carbon dioxide, it’s “more efficient at trapping radiation.”

"A massive stream of wastewater tainted with hydrocarbons has been flowing into Utah from oil and gas mining on Colorado’s West Slope."

"The Western U.S. is getting higher and drier."

"The bald eagle may no longer be at risk of extinction, but the U.S. effort to protect the national bird became harder on Wednesday."

"A 15-mile stretch of the Ohio River closed after a fuel oil spill reopened to river traffic on Tuesday with some restrictions as containment and cleanup continued."

"Kurdish and Iraqi forces seized control of Iraq’s largest dam from Islamic State militants as the U.S. deployed air power that helped reverse some gains made by the Sunni-Muslim insurgents in the north."

"Montana farmer Rocky Norby has worked the land along the Missouri River for more than 20 years, coaxing sugar beets and malted barley out of the arid ground."

"WILLOWS, Calif. — When the winter rains failed to arrive in this Sacramento Valley town for the third straight year, farmers tightened their belts and looked to the reservoirs in the nearby hills to keep them in water through the growing season."

"Back in April 2006, officials from West Virginia American Water told state regulators they were planning to review the Elk River watershed to find out what potential contamination sources were upstream from their Kanawha Valley water treatment plant."