"It would be one of the largest nuclear weapons investments since World War II. A watchdog group says the work -- which may not be needed -- can be done for less elsewhere."

"The leaders of 25 environmental and climate action groups sent an open letter to President Barack Obama on Tuesday, urging him to reject the proposed Keystone XL pipeline and avoid any 'deal-making' with the Canadian government."

"The damage from oil during the BP Deepwater Horizon disaster to communities of tiny organisms living in and on the soft sediment on the floor of the Gulf of Mexico surrounding BP's Macondo well will take decades to repair, according to a new scientific study conducted by NOAA, BP and university researchers."

"WASHINGTON -- From mercury to pesticides, Americans are exposed daily to environmental chemicals that could harm reproductive health, the nation's largest groups of obstetricians and fertility specialists said Monday."

"A federal judge in New Orleans has handed environmental groups what amounts to half a loaf in their push for federal regulations on the flow of pollutants into the Mississippi River that fuels the annual spring low-oxygen 'Dead Zone' along Louisiana’s Gulf coast."

"Environmental inspections of oil and gas facilities on public lands have jumped nearly twofold since 2007, but federal investigators said Monday that the government is doing a poor job of targeting the riskiest sites."

"WASHINGTON — The Obama administration on Friday set the first-ever limits on greenhouse gas emissions from power plants, but their impact could be minimal because they don’t apply to existing plants and there are few coal-fired power plants being built in the United States."

"WASHINGTON — Hunting for offshore oil in remote and unforgiving Arctic waters requires vessels capable of withstanding crushing blows from icebergs, a nearby stash of emergency equipment and other specialized resources, according to a new report from Pew Charitable Trusts."

"Climate-change activist and author Bill McKibben and Seattle Mayor Mike McGinn headlined a Saturday demonstration against coal and oil exports."

"The good news: A sample of what are probably the best fracked wells in the country finds low emissions of methane, a potent heat-trapping gas. The bad news: The study likely missed the super-emitters, the wells that are responsible for the vast majority of methane leakage."