"Trouble in a major Delaware City Refinery unit sent dark smoke billowing from a stack at the plant early [Tuesday] morning, triggering calls to regulators from nearby residents."

"ROCKINGHAM COUNTY, Va. -- Kim Sandum is driving on a one-lane gravel road inside the George Washington National Forest, the largest federally protected forest on the East Coast. She points to a trout stream gurgling over rocks and shallows not 20 feet from her rolling minivan."

"GE Energy Services' coal-fired power plant in Homer City will be required to meet federal standards for emissions of sulfur dioxide that are more protective of human health."

"More than two years ago the Marcellus Shale Coalition, a gas industry trade group, began building an electronic database to house information about the water quality in thousands of private wells across Pennsylvania."

"A freight train smacked into a truck carrying garbage and careened off the tracks in Rosedale Tuesday afternoon, triggering an explosion felt throughout the region and sending up a plume of black smoke visible for miles."

"EWELL, Md. -- Superstorm Sandy barely laid a glove on Smith Island last fall, to hear residents tell it. Though storm-driven flooding damaged hundreds of homes in Crisfield and the rest of Somerset County, only a couple islanders got any water in their homes from the surging Chesapeake Bay."

"Behold the tiny oyster. No, not on the half-shell, with a squirt of lemon, but in its watery habitat, the Choptank River. Out there on a reef with many other oysters, the bivalve is awesome, a janitor that helps remove pollution with incredible efficiency."