Defense Secretary Chuck Hagel has been considering delaying the Pentagon's portion of a $510 million federal program to invest in biofuel refineries that has been the subject of congressional battles for more than a year, according to multiple sources with knowledge of the deliberations.

A Sierra Club lawsuit over a Kentucky coal mine's discharges of a chemical not listed on the mining company's Clean Water Act permit has raised industry concerns and green groups' hopes about the litigation's impact on pollution cases nationwide.

At a time when international competition is heating up to export liquefied natural gas into Asia, Alaska is scrambling to become a major player in foreign export markets, while also giving state consumers access to local fuel.

Rescuers were finishing a grim search for victims in central Oklahoma last night as scientists confirmed that it was the strongest tornado to land in the United States since a deadly flurry of them struck Southern states two years ago.

House appropriators yesterday proposed allocating $24.3 billion to the subcommittee that funds the Interior Department, Forest Service and U.S. EPA for next fiscal year, a level that would likely require significant cuts to a host of conservation programs, clean water grants, and climate change and habitat restoration work, environmentalists warned.

Researchers have uncovered a mechanism in the Alaskan tundra that doesn't seem to follow the climate change script for soil carbon.

The incendiary national debate over Keystone XL tends to center on Nebraska, but energy-rich Alaska has become the muse for today's GOP push to build the 1,179-mile pipeline.

The Supreme Court yesterday declined to review a large climate change lawsuit brought by a Native Alaskan village against major energy producers. Villagers had claimed that the companies' operations were contributing to global warming, which in turn was eroding their land off the northwest coast of Alaska, about 70 miles north of the Arctic Circle.