"Injection wells used to dispose of the nation's most toxic waste are showing increasing signs of stress as regulatory oversight falls short and scientific assumptions prove flawed."

"A US pharmaceutical company is set to introduce a controversial new genetically modified corn to help farmers fight resistant weeds. Dow Agrosciences says its new GM product will use a chemical that was once a component of the Vietnam war defoliant, Agent Orange."

"Canned albacore tuna purchased by U.S. schools contains more mercury than what government officials have reported, raising the risks for some tuna-loving kids, according to a new study from a coalition of advocacy groups."

"Consumer Reports is urging U.S. limits for arsenic in rice after tests of more than 60 popular products -- from Kellogg's Rice Krispies to Gerber infant cereal -- showed most contained some level of inorganic arsenic, a known human carcinogen."

"Some of the world's biggest fertilizer companies are banking that the aftermath of the worst U.S. drought in 56 years will boost sales, as U.S. farmers seek to cash in on high crop prices."

"A study finds young whites with high levels of exposure to bisphenol A are more likely to be obese. For other ethnic groups, the link is weak."

"Chlorine has long been the industry standard to keep pool water clean and clear, but consumer demand for alternatives has prompted the emergence of new technologies, including the saltwater systems that came into vogue a few years ago and the copper-and-silver ionization and ozone-gas systems that are increasingly popular."

"Canada dropped its longtime opposition on Friday to the international listing of asbestos as a hazardous material, a designation intended to curb the use abroad of the fire-resistant substance, which can cause cancer and other illnesses."

"AUSTIN -- Exxon Mobil Corp. has reported inadvertent emissions of large amounts of pollutants at its flagship refinery near Houston."

"The Portland City Council voted 5-0 during a raucous public meeting Wednesday morning to add fluoride to Portland's drinking water, ending the city's status as the only major U.S. city that hasn't approved fluoridation."