"LONDON/PARIS -- A corrosive drilling fluid that triggered the North Sea's worst gas leak in 20 years could threaten similar deep-sea wells across the world, and operator Total has already warned Shell that its nearby Shearwater field may be at risk."

"The eight-state commission that sets water quality standards for the Ohio River wants a two-year delay on enforcement of a more stringent mercury standard while it considers relaxing those rules."

"More than half a century has elapsed since the Seattle School Board — with nary a raised eyebrow, records indicate — voted to allow one of the nation's biggest and busiest highways to be built cheek-by-jowl with John Marshall Junior High, trading away the school's playground for a larger plot of land nearby."

"Federal regulators have reached a tentative deal with Carnival Corp. on a plan to reduce air pollution from nearly a third of its cruise ships, but the accord comes too late to reverse at least a temporary loss of lucrative cruise business for Baltimore."

"CAMBRIDGE, Mass. -- Polluted air causes roughly 200,000 early deaths each year across the United States, researchers from the Massachusetts Institute of Technology conclude after tracking emissions from industrial smokestacks, vehicle tailpipes, marine and rail transport, and commercial and residential heating."

"Prescription drugs are contaminating Lake Michigan two miles from Milwaukee’s sewage outfalls, suggesting that the lake is not diluting the compounds as most scientists expected, according to new research."

"Fearing the city's primary drinking water source could be at risk of contamination in the years ahead, Ann Arbor officials took action Tuesday night to send a message to the state."

"VIRGINIA KEY, Fla. -- The wastewater plant on this barrier island sits tucked in a northern corner, away from the wading birds, views of Miami Beach and grassy vegetation providing prime picnic spots."

The small Michigan town of Mancelona is the site of one of the nation's largest underground plumes of the toxic industrial solvent trichloroethylene. Wells dug to supply uncontaminated water are now themselves threatened.

"Japan pledged nearly $500 million to contain leaks and decontaminate radioactive water from the tsunami-crippled Fukushima nuclear plant, as the government stepped up its intervention in the worst atomic disaster in a quarter century."