"Friends say he has the vigor of a younger man, but Ed Merrifield knows the truth. He is tiring at age 65, and ready to give up his demanding third career as the Potomac riverkeeper."

"A signature battle of the energy boom, a public fight over a waste-water deep disposal well, plays out amid scientific uncertainty over safety in a small town."

Many anglers who pull fish out of the Anacostia River near Washington, DC, eat them despire health warnings.

"Contractors worked throughout the night to remove and replace an 800-foot swath of Interstate 77 that turned from asphalt to cinder in a massive natural gas line explosion that also flattened four homes and damaged five more but caused no deaths."

"CHARLESTON, W.Va. -- Details began to emerge Wednesday of previous problems at a Harrison County coal-slurry impoundment, as CONSOL Energy continued its efforts to locate a coal miner missing and presumed dead following last week's collapse of an embankment at the facility."

"Salty bromide concentrations in the Monongahela River, which had risen in 2009 and 2010 due, at least in part, to discharges of Marcellus Shale gas drilling wastewater by sewage treatment plants, returned to normal levels in 2011 and this year, according to a Carnegie Mellon University river monitoring study."