"Researchers have pinpointed the source of what is probably the worst mass poisoning in history, according to a study published Sunday. For nearly three decades scientists have struggled to figure out exactly how arsenic was getting into the drinking water of millions of people in rural Bangladesh."

"U.S. District Judge Robert Hinkle today said he will approve a legal settlement that calls for the federal government to set specific water quality standards for nutrients in Florida."

"Ocean acidification, caused by rising CO2 levels, is affecting not only coral reefs, but coastal ecosystems by changing everything from the ability of oysters to adhere to the riverbed to the extent of dead zones along the U.S. Pacific coast."

"A report shows concentrations of several major pesticides mostly declined or remained the same in the U.S. 'Corn Belt' rivers and streams from 1996 to 2006."

"As the debate over the merits of Marcellus Shale development reaches a crescendo, an Ithaca researcher has culled a list of 270 files documenting wastewater spills, well contamination, explosions, methane migration and ecological damage related to gas production in the state since 1979."

"Hundreds of gasoline spills, which contain carcinogens like benzene, are reported each year in Nassau and Suffolk counties. Countless others go unreported or unnoticed. Cleaning them up can run into the millions and take decades to complete."

"Federal officials said Wednesday they have given marching orders to Maryland and other states that drain into the Chesapeake Bay to come up with detailed plans for reducing pollution plaguing the estuary, warning that states face development shutdowns or other as-yet unstated consequences if the water fails to get cleaner."

California lawmakers ended months of negotiations with final agreement on a historic water package. The legislation now goes to Governer Schwarzenegger, and an $11.1-billion bond measure goes before the voters.

"A huge fire has been blazing at an oil rig in the Timor Sea since Sunday, after an attempt by the oil company to kill a leaking well. The West Atlas rig is located directly above the Montara well head platfrom, which has been leaking oil and gas since August 21."