"The global mining firm Rio Tinto announced Monday that it will divest its 19 percent stake in the controversial Pebble Mine project in Alaska,  donating its shares to two state charities."

"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."

"For more than 50 years farmers across North America have been spraying atrazine, a pesticide, on crops, mainly corn, applying millions of pounds a year."

"Outside Alicia Barksdale’s living room, high above Upper Manhattan, the brick chimney atop the building next door belches black smoke all winter long, and even into the spring."

"Exxon Mobil Corp, the world's largest publicly traded oil company, has agreed to disclose more information about the environmental risks of hydraulic fracturing, the process known as fracking."

"The Interior Department has thousands of mismanaged injection wells on federal lands, threatening the nation's underground supply of drinking water, according to a newly released inspector general report."

"People in natural gas drilling areas who complain about nauseating odors, nosebleeds and other symptoms they fear could be caused by shale development usually get the same response from state regulators: monitoring data show the air quality is fine. A new study helps explain this discrepancy. The most commonly used air monitoring techniques often underestimate public health threats because they don’t catch toxic emissions that spike at various points during gas production, researchers reported Tuesday in the peer-reviewed journal Reviews on Environmental Health. The study was conducted by the Southwest Pennsylvania Environmental Health Project, a nonprofit based near Pittsburgh."

"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."

"Faced with public outrage about gritty black dust blowing through Chicago’s Southeast Side, Mayor Rahm Emanuel talked of forcing towering mounds of petroleum coke out of Chicago and outlawing new piles with costly regulations. But the fine print of a zoning ordinance unveiled Tuesday by the Emanuel administration opens the door for greater use of the high-sulfur, high-carbon refinery byproduct in the city."