As part of a major U.S.-China agreement to cut greenhouse gas emissions, President Obama and Chinese President Xi Jinping also decided to keep plugging away at an energy research partnership viewed as a bright spot in the nations' relations.

The second phase of what is believed to be the world's largest ocean-based geoengineering experiment started out with an early-morning knock on the door of the Vancouver offices of the aboriginal corporation in British Columbia that had conducted it.

Even though Republicans will control the Senate next year, both parties scrambled yesterday to use the debate over the Keystone XL pipeline to affect one outstanding race -- the Dec. 6 runoff election between Sen. Mary Landrieu (D-La.) and Republican Rep. Bill Cassidy.

A climate deal between the United States and China could spur new regulations on vehicle-efficiency standards, refrigerant pollutants and methane emissions from the oil and gas sector, launching a new round of executive action that is sure to raise objections from a Republican-dominated Congress.

Republican Sen. John Hoeven of North Dakota is holding back his legislation to fast-track the Energy Department's reviews of liquefied natural gas exports until next Congress in order to reach a deal with -- and gain the support of -- Energy Secretary Ernest Moniz.

The Department of Energy's inspector general has found that Sandia National Laboratories violated the law by using federal money to lobby Congress and the Obama administration.

The Obama administration has decided to formally list the Gunnison sage grouse as threatened under the Endangered Species Act, a decision expected to be derided by environmentalists as insufficient to save the bird and by government and industry leaders as an unnecessary disruption of economic development across its range in Colorado and Utah.