"COLUMBUS, Ohio -- Federal environmental regulators are investigating a January chemical emergency at an Ohio oil well and asking why an inventory of the facility's chemicals wasn't available to local authorities, according to a letter released Wednesday by a coalition of activists."

"WASHINGTON -- President Obama, declaring that 'Americans across the country are already paying the price of inaction,' announced sweeping measures on Tuesday to reduce greenhouse gas pollution and prepare the nation for a future of rising temperatures."

"In a win for the U.S. Environmental Protection Agency, the Supreme Court on Monday agreed to consider the legality of a controversial Obama administration effort to regulate air pollution that crosses state lines."

"In 2006, the EPA’s Chicago office told Midwestern fertilizer dealers it found problems with nearly all their safety plans for poisonous anhydrous ammonia. Fix them, the EPA wrote the dealers, or face possible fines."

"Federal prosecutors unveiled new criminal indictments on Wednesday against a former BP Plc executive and a former BP engineer charged with obstructing investigations into the April 2010 Gulf of Mexico oil spill."

"As the Environmental Protection Agency seeks public comment on how to gauge the environmental impact of a proposed gold and copper mine in the Bristol Bay watershed, hundreds of thousands of Americans have weighed in on one side or another."

"Illinois Gov. Pat Quinn on Monday signed into law the nation's strictest regulations for high-volume oil and gas drilling."

Part 1: "Whose Interests Is Maine’s DEP Commissioner Serving?"

"For two years, public servant Patricia Aho has overseen Maine's environmental protection. But whom does she really serve? A seven-month investigation by the Telegram points to her former corporate clients. ... Overseen by a former chemical industry lobbyist, Maine’s Department of Environmental Protection resists regulations on substances that may be harmful to children and fetuses."

"The Supreme Court ruled today that Texas has no right to Oklahoma's water under a 1980 interstate compact in a case seen as having broad implications in the arid western United States."