"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."

"North Carolina’s environment agency has taken the unusual step of returning a federal grant to study streams and wetlands that could be harmed by hydraulic fracturing for natural gas."

"New regulations to oversee hydraulic fracturing of oil and gas wells in Alaska could be issued later this year by state regulators, officials said at a public hearing on Monday."

"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."

"Airlines on Monday urged a UN aviation group to back a mandatory global framework to curb airline emissions, saying failure to reach a deal would revive threats of a trade war."

"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."

"KARNES CITY, Texas -- In the five years since the shale boom hit, the once-beautiful hills of south Texas have been transformed into a scarred, industrial landscape. The residents’ health is part of the collateral damage, according to the environmental watchdog group Earthworks. Their new study documents hazardous chemicals in the air and serious ailments reported by families living in close proximity to drilling operations."

"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."