Carbon dioxide concentrations in the atmosphere have crossed a major threshold: 400 parts per million. Here are five key points on how carbon dioxide is affecting Earth’s atmosphere and the role we're playing in it.

To better predict where thunderstorms will rip across the central United States this spring, researchers are teaming a high-flying aircraft with fine-grained computer simulations.

The last month has seen a trail of smashed records across the central United States, as pulse after pulse of cold air careened down the Great Plains. How does this fit into the bigger picture of a warming U.S. climate?

The custom forecasting systems are designed to increase the reliability of solar and wind energy.