Washington state's attorney general said on Wednesday he intends to sue the U.S.

Pressure is growing on regulators in California and Washington, D.C., to crack down on methane, a greenhouse gas that's 25 times more potent than carbon dioxide and is accelerating the warming of t

A tornado warning briefly rattled the U.S. capital on Wednesday as a severe storm swept through the Washington area.

The report says that logging in the area may have played a role.

Federal wildlife refuges in the Northwest and Hawaii will phase out a class of pesticides that are chemically similar to nicotine because they pose a threat to bees and other pollinators key to cro

Washington DC is giving foam carry-out containers the boot in an effort to make the city more sustainable.

An Iowa Supreme Court ruling may spur the growth of solar energy in the state, accord to an industry group.

Washington state awarded $14.3 million in matching grants to three utilities to develop battery systems to store power from intermittent, renewable sources.

Pesticides may be linked to a spike in cases involving breathing difficulties and skin rashes in central Washington state, health officials said on Monday.

Vermont became the first state in the US on Thursday to adopt a law requiring labels for foods containing genetically modified ingredients.