"The latest research on the District's decade-long effort to reduce lead in its drinking water is likely to reverberate well beyond the city's borders and add a chapter to one of the more tortuous public health chronicles of the past century."

"The storms blew through Hampton Roads on a Thursday in August, and after the storms came runoff, lots of it, shooting off roofs and pavement into storm drains, and a week after the runoff came the red tide. At Ocean View in Norfolk, the waves were mahogany with pale-red caps, stained by a sudden growth spurt of algae."

"A university scientist and the federal government say they have found persuasive evidence that oil from the massive Gulf of Mexico spill is settling on the ocean floor."

"States are taking the lead with studying levels of radon in drinking water and air even as federal regulators lag, as a coincidence of geology and population density leaves some more at risk than others of suffering from the naturally occurring radioactive [contaminant]."

"A nascent technology, tidal power is destined to remain a niche player in the United States' energy portfolio. But the low-carbon energy source has one advantage over wind and solar: It's as dependable as the moon's phases. Investors and public utilities are taking notice."

"A black sealant sprayed on parking lots, driveways and playgrounds turns out to be the largest contributor to the rise of a toxic pollutant in urban lakes and reservoirs across America, according to a new U.S. Geological Survey study."