For the first time in four years U.S. carbon emissions increased, mostly because a booming economy used more energy resources, even with a shift toward renewable energy and natural gas. But can a booming economy and rising emissions decouple? Click the audio player above to hear the full story.

Fracked oil wells decline in output quickly — requiring more fracked wells

Customs officials seized a live shipment of the animals which can carry disease.

The Bureau of Reclamation declares the first water shortage for the Colorado River basin, which provides water for tens of millions of people and large agricultural regions.

The Environmental Protection Agency is expected to propose a new rule today that will require refiners to cut the amount of sulfur in gasoline by two thirds.

Dan Lungren, Ami Bera battle in targeted race that pits energy against the environment

Author Florence Williams talks about her new book, "Breasts," and how environmental pollution affects them.