"Drilling for shale gas through hydraulic fracturing, or fracking, appears to cause smaller leaks of the greenhouse gas methane than the federal government had estimated, and considerably smaller than some critics of shale gas had feared, according to a peer-reviewed study released on Monday."

"SAN FRANCISCO — In the coastal redwood forests of central California, scientists trying to unravel the mystery surrounding the reproductive problems of dozens of endangered condors think they have uncovered the culprit: the long-banned pesticide DDT."

"WASHINGTON — The coal industry, feeling threatened by federal efforts to promote wind and solar power, has opened a counterattack by opposing President Obama’s nomination of a renewable electricity advocate to head the federal agency with jurisdiction over power lines."

"DETROIT — Automakers are making slow but steady progress improving fuel efficiency, as the industry hit a high for the average miles per gallon of new vehicles sold in August in the United States."

"Something peculiar is happening to rivers and streams in large parts of the United States — the water's chemistry is changing. Scientists have found dozens of waterways that are becoming more alkaline. Alkaline is the opposite of acidic — think baking soda or Rolaids."

"Prodded by health and environmental advocates, Wal-Mart Stores announced Thursday that it will require suppliers to disclose and eventually phase out nearly 10 hazardous chemicals from the fragrances, cosmetics, household cleaners and personal care products at its stores."

"The Senate on Wednesday plunged into its biggest debate on energy policy in years, by taking up a modest, bipartisan bill that aims to boost the efficiency of buildings nationwide."

"The Senate is debating a bipartisan energy bill this week that if passed would become the first substantial energy legislation in six years."

"Pavillion, Wyo., is a tiny community of fewer than 300 people, nearly 2,000 miles from Washington, D.C., in a deeply Republican state that President Obama never had any chance of winning. But Obama's top aide on energy issues, Heather Zichal, took a significant interest in the community's water supply in late 2011 and early 2012."

"This month, the Environmental Protection Agency will propose standards that will establish stricter pollution limits for gas-fired power plants than coal-fired power plants, according to individuals who were briefed on the matter but asked not to be identified because the rule was not public yet."