"The U.S. Environmental Protection Agency announced a proposal to eliminate mercury pollution from dental offices nationwide."

"A persistent chemical formerly used in Scotchgard still contaminates most fish in U.S. rivers and the Great Lakes despite a phase-out a dozen years ago, a new federal study shows."

"Google executive chairman Eric Schmidt has given $29,000 over the past six years to politicians who could be lumped in with the 'liars' on climate change that he denounced this week."

"Nine years after levee failures flooded New Orleans during Hurricane Katrina and two years after Hurricane Sandy devastated the East Coast, the nation has failed to determine the flooding risks faced by communities across the United States, the American Society of Civil Engineers said in a new report."

"NEW YORK -- Protecting the infrastructure of American cities from the effects of climate change is rising on the agenda of the U.S. Department of Homeland Security, according to a top agency official."

"As a domestic energy boom driven by hydraulic fracturing spreads, so could strip-mining for sand needed for the controversial production process, introducing risks to water, air, public health and property values, according to a report issued Thursday."

"Native groups from the United States and Canada Monday signed a treaty to establish intertribal alliances to restore the American buffalo on Tribal and First Nations Reserves or co-managed lands in both countries."

"SEATTLE - Faced with increasing criticism of a proposal that would restrict media filming in wilderness areas, the head of the U.S. Forest Service said late Thursday that the rule is not intended to apply to news-gathering activities."

"The Obama administration is pulling out the stops to renew and expand a little-known program that uses offshore drilling revenue for conservation."