"Residents have complained for years about thick black smoke and possible pollution coming from the MarkWest gas plant in Chartiers. But the state Department of Environmental Protection said it couldn't take action because it had no evidence. On Tuesday, the department said it had the goods."

"Three months ago, the Obama administration made a little-noticed but potentially pivotal move in the stepped-up fight against climate change: it boosted the U.S. government's official estimate of the future economic damage caused by carbon pollution."

"WASHINGTON -- About 200 environmental activists gathered in front of the State Department Monday morning to protest the proposed expansion of the Keystone XL pipeline through the midwestern United States."

TransCanada and Department of Homeland Security keep close eye on activists, FOIA documents reveal."

"Above the harbor in Baltimore’s industrial Curtis Hill district is a one-acre urban farm. Jason Reed, a community organizer who works there, described the view. 'I can look out over the harbor, and you can see the piles and piles of coal,' he said."

"SALT LAKE CITY -- Animal-welfare activists filed a lawsuit Monday to overturn a Utah law that prohibits undercover filming while trespassing at farm operations, saying it restricts free expression."

"Evangelical scientists have urged members of Congress to act on climate change in a letter calling for legislation to reduce carbon emissions and protect the environment."

"When environmental journalist David Sassoon began reporting about the billionaire Koch brothers’ interests in the Canadian oil industry last year, he sought information from their privately held conglomerate, Koch Industries. The brothers, who have gained prominence in recent years as supporters of and donors to conservative causes and candidates, weren’t playing. Despite Sassoon’s repeated requests, Koch Industries declined to respond to him or his news site, InsideClimate News."

The incidence of autism has increased in recent decades, but scientists are still struggling to understand what causes the developmental disorder. Now they are starting to suspect "environmental epigenetics" may play a key role in its origin.