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.
Relying on old technology like diesel could prove fatal, an expert says.
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.