"Smaller than a virus and used in more than 200 consumer products, silver nanoparticles can kill and mutate fish embryos, new research shows."

As U.S. chlorine plants convert to cleaner technology, they are leaving behind large stocks of mercury. There is a danger that mercury will find its way to dangerous and polluting uses on the global market. Efforts to ban mercury export have not been effective.

"Facing the possibility of a $27 billion pollution judgment against it in an Ecuadorean court, Chevron launched an aggressive lobbying and public relations campaign to try to prevent the judgment as well as reverse a deeply damaging story line."

"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."

When electric utility customers pay extra for "green power certificates," are they really getting green power?

"The awards of $18.5 billion in federal loan guarantees for new nuclear plant projects remain held up by an ongoing dispute within the Obama administration over the financial risk the new reactors pose for the government and taxpayers, according to industry and government officials."

"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."

"President Barack Obama says the United States and China are looking for a comprehensive deal during next month's climate change summit that will 'rally the world.'"

Discovery of a fungus associated with "White Nose Syndrome," which is killing millions of bats in the easter US, is just the beginning of an unravelling mystery, a Boston University bat biologist says.