"PITTSBURGH -- A former top environmental official says Pennsylvania’s successful efforts to keep Marcellus Shale wastewater away from drinking water supplies should be extended to all other oil and gas drillers."

"Residents waiting to learn whether their property was contaminated by an insecticide manufacturing plant in their Park Hill neighborhood want to know why it took officials about 25 years to begin testing the soil in and near what has become the city's newest Superfund toxic waste site."

"Protests on the Navajo Nation have been in high gear ever since last week, when tribal members and activists got wind of a proposed settlement that aims to help quantify Navajo water rights on the Little Colorado River. Trouble is, many Navajo citizens believe the settlement may actually erode the tribe's sovereignty when it comes to maintaining a safe and sufficient future water supply."

"It's wild times in the watershed. The most happy-go-lucky denizen of Bay Area creeks is back, after a hiatus of at least three decades: the river otter."

"With spring having sprung, it will only be a matter of time before many area residents who have ash trees will find out if their trees will be added to the rapidly growing list of victims of the notorious emerald ash borer."

"HOBSON, Texas -- At the back of a South Texas uranium processing facility, a few dozen black container drums stood outside, waiting to be shipped. Each was filled with about $50,000 worth of yellowcake, a powdery substance created from raw uranium."

A coal-fired power plant in Georgia has neighbors worried about the consequences of its ash-disposal pond.

"Durham School Services will pay a $90,000 federal fine and do environmental projects worth $348,000 to settle charges that it routinely allowed its school buses to idle excessively in Connecticut, Rhode Island, and Massachusetts. The company operates in 30 states and has one of the largest school-bus fleets in the nation."

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"Wading into a decade-old controversy, former Environmental Protection Agency chief Christine Todd Whitman has urged current EPA administrator Lisa Jackson to close loopholes in a 2006 chemical security law 'before a tragedy of historic proportions occurs.'"