"The Obama administration will require that vehicle fleets average 54.5 miles per gallon by 2025, according to people with knowledge of the talks. That would mark a sharp increase in efficiency."

"The U.S. State Department said Friday it expects to issue a final environmental assessment next month on TransCanada Corp's proposed $7 billion pipeline that would deliver crude from Canada's oil sands to refineries to Texas."

"Less than half of Pennsylvania's fossil-fueled power plants have pollution controls, a long-tolerated dirty habit that's now getting its comeuppance in tougher, new federal regulations."

"Thousands of residents living atop the gas-rich Marcellus Shale ... signed lowball leases in the years leading up to the boom in Pennsylvania. In those early days a half-decade ago, virtually no layperson had even heard of the rock formation, let alone knew that drillers had found a way to access the huge reservoir of natural gas locked inside it."

"Despite decades of efforts to restore and protect the Great Lakes, dozens of old power plants still are allowed to kill hundreds of millions of fish each year by sucking in massive amounts of water to cool their equipment."

"New York Mayor Michael Bloomberg joined with the Sierra Club on Thursday in a $50 million, four-year plan to campaign for replacing one-third of aging U.S. coal-fired power plants with clean energy."

"Federal regulators laid down principles on Thursday for planning and paying for new power lines, part of a long-term policy effort to help the nation's electricity grid grow enough to meet the demands of renewable energy and a competitive electricity market."

"The Senate Energy and Natural Resources Committee on Thursday ended a markup without taking highly anticipated votes on a plan guaranteeing energy production revenue to coastal states and the underlying offshore drilling safety bill."

"Federal environmental regulators are questioning the rationale of a proposed 39-mile natural gas pipeline that opponents say would damage 600 acres of pristine forests and streams in northern Pennsylvania's Endless Mountains region."