"Several environmental groups sued Arizona Public Service Co. and the other owners of the Four Corners Power Plant in New Mexico on Tuesday, seeking to shut down the power plant if they won't add additional pollution controls to the facility."

"A document filed with Canada's Energy Board appears to cast doubt on claims by Koch Industries that it has no interest in the controversial pipeline."

"An environmental group accused Republican Rep. Steve Pearce of New Mexico of inciting a county in his district to flout federal environmental laws by bulldozing 47 road crossings through a stretch of the San Francisco River in the Gila National Forest."

"The Environmental Protection Agency, under pressure from some states, industry and Congress, is expected to ease an air quality rule that would require power plants in 27 states to slash emissions, said people familiar with the matter."

"The proposed Keystone XL pipeline -- which would carry unstable, corrosive, goopy, hard-to-clean-up bitumen right down the middle of the country -- could be a tempting target for terrorists."

"An all-but-forgotten rocky outcropping in Southern California contains ore that could help break the country’s dependence on China for certain types of rare earth metals, according to the only American producer of rare earths."