"Veteran marijuana farmers say newcomers to Northern California’s pot hotbed use toxic, harmful methods to cash in."

"Scientists have found a more than 7,300-square-mile ring of land and water contaminated by mercury surrounding the tar sands in Alberta, where energy companies are producing oil and shipping it throughout Canada and the U.S."

"Federally funded efforts to curtail farm pollution of the Chesapeake Bay are falling short, and recent spending cuts by Congress cast doubt on the efforts' ultimate success, an environmental group said Monday."

"Air pollution isn't just an outdoor problem. Unhealthy fumes may be emitted inside your own home if you're cooking over an unvented gas stove."

"BEIJING -- More than 8 million acres of China's farmland is too polluted with heavy metals and other chemicals to use for growing food, a Cabinet official said Monday, highlighting a problem that is causing growing public concern."

"Unhealthful levels of lead, arsenic and mercury were detected for the first time in several soil samples of the Calavera neighborhood in West El Paso, according to a recent remedial investigation report prepared for the Asarco Custodial Trust."

"ST. PETERSBURG, Russia — Russian investigators have dropped charges against all but one of the 30 crew of a Greenpeace ship, who were accused of hooliganism following a protest outside a Russian oil rig in the Arctic, the group said Wednesday."

"The Environmental Protection Agency was justified in intervening to examine possible risks of gas drilling to Texas drinking water, the agency's internal watchdog reported Tuesday. But environmentalists say the report raises fresh concerns about the EPA's 2012 decision to halt its investigation into possible well water contamination in Parker County, Texas."

"The EPA Inspector General's report is the latest analysis to spotlight the regulator's handling of high-profile cases of alleged drinking-water contamination near natural gas drilling sites.

"The history of the Chesapeake Bay oyster hasn't always been a pure one. So you could forgive a chef for being skeptical about the big bivalve comeback being staged in D.C. and the surrounding area this winter as oyster season gets underway."

"A crisis grips the Indian River Lagoon. Record numbers of manatees, dolphins and pelicans died in the past year — often from mysterious maladies. Sea grass flats are decimated. Unprecedented algae blooms have formed."