"WASHINGTON — A federal appeals court Tuesday upheld the Environmental Protection Agency's first-ever limits on air toxics, including emissions of mercury, arsenic and acid gases, preserving a far-reaching rule the White House had touted as central to President Barack Obama's environmental agenda."

"Jodi Ross, town manager in Westford, Mass., did not expect she would be threatened with arrest after she and her fire chief went onto the railroad tracks to find out why a train carrying liquid petroleum gas derailed on a bridge in February. But as they reached the accident site northwest of Boston, a manager for Pan Am Railways called the police, claiming she was trespassing on rail property. The cars were eventually put back on the tracks safely, but the incident underlined a reality for local officials dealing with railroads."

"BANGKOK — As head of his village, Prajob Naowa-opas battled to save his community in central Thailand from the illegal dumping of toxic waste by filing petitions and leading villagers to block trucks carrying the stuff — until a gunman in broad daylight fired four shots into him."

"U.S. officials ended a stand-off with hundreds of armed protesters in the Nevada desert on Saturday, calling off the government's roundup of cattle it said were illegally grazing on federal land and giving about 300 animals back to the rancher who owned them."

"Two months after a pond of pollutants at a defunct Duke Energy plant in North Carolina spilled thousands of gallons of coal ash into the Dan River, coating the riverbanks in a “toxic soup” 70 miles long, environmental groups say the state is reneging on its promise to hold the nation’s largest energy company responsible for its actions."

"The U.S. Environmental Protection Agency's chief said on Monday that new carbon pollution standards due in June will be flexible enough for all states to meet but will be environmentally stringent and federally enforceable."

"A chemical plant holding a 'minor' stormwater discharge permit caused a major drinking water disaster in Charleston, W.Va., in February. That incident raises questions about risks from thousands of industrial chemicals used daily along waterways such as the Ohio River — the source of drinking water for more than 5 million people from Pittsburgh to Cairo, Ill."

"HOUSTON — A giant Texas oil company, Anadarko Petroleum, has agreed to pay $5.1 billion for a vast environmental cleanup, a sum the Justice Department said was the largest it had ever won in such a case."

"Even when pollution discharges from shale gas well pads and impoundments contaminate private water supplies, those violations often go unrecorded or publicly reported by state environmental regulators, according to documents filed in the Pennsylvania Superior Court case challenging the constitutionality of the state's oil and gas law, Act 13."