A recently released government report describes the impact global climate change is already having on U.S. farms, wildlife, forests and water supplies. One of the report's lead authors discusses its findings.

A huge slab of ice has fallen off the western Antarctic peninsula, threatening the ice shelf behind it. Scientists say the collapse shows how quickly polar changes can occur amid certain climate conditions. A climatologist explains.

The U.S Department of Energy's Solar Decathlon brought teams from 20 universities to the National Mall to showcase their designs for a modern, solar-powered home. Interest in the event has grown amid new concerns over energy costs and climate change.