"Federal prosecutors widened their investigation triggered by a massive coal ash spill in North Carolina, demanding reams of documents and ordering nearly 20 state environmental agency employees to testify before a grand jury."

"CHURCH ROCK, N.M. — In this dusty corner of the Navajo reservation, where seven generations of families have been raised among the arroyos and mesas, Bertha Nez is facing the prospect of having to leave her land forever."

"Prime Minister Stephen Harper was again rebuffed in his bid to press U.S. President Barack Obama to approve the controversial Keystone XL pipeline when he raised the issue during a North American leaders’ summit in Toluca, Mexico."

"A Nebraska court on Wednesday invalidated the governor's decision to allow the Keystone XL pipeline to pass through the Midwestern state, casting new uncertainty over the controversial project to link Alberta's oil sands with refineries in Texas."

"Canadian Prime Minister Stephen Harper’s frustration with U.S. President Barack Obama’s failure to approve the Keystone XL pipeline may make this installment of the North America summit, known as the “Three Amigos,” the frostiest since the annual meetings began almost a decade ago."

"The head of nuclear safety for the cleanup of the former nuclear weapons site at Hanford, Wash., was fired Tuesday after allegations she made over several years that the construction project was ignoring serious safety problems."

"WASHINGTON — Energy Secretary Ernest Moniz is set to announce on Wednesday that he will finish a $6.5 billion loan guarantee this week and another soon for $1.8 billion to help three Georgia electric companies build the first new nuclear reactors in the United States in three decades."

"UPPER MARLBORO, Md. — President Obama on Tuesday ordered the development of tough new fuel standards for the nation’s fleet of heavy-duty trucks as part of what aides say will be an increasingly muscular and unilateral campaign to tackle climate change through the use of the president’s executive power."

"Energy industry donors made significant investments in the re-election bids of both Senate Minority Leader Mitch McConnell (R-Ky.) and Sen. Mary Landrieu (D-La.) during the final months of 2013, while also opening their checkbooks to boost a trio of Republicans seeking seats where veteran Democratic senators are retiring."

"If you think the roads you're driving on seem worse than usual this winter, you're probably right. The waves of snowstorms in much of the country have exhausted supplies of rock salt, the main tool that road crews use to melt ice and snow."