Severe weather: Flood, fire and drought – More than 300 experts helped produce the report over several years, updating a previous assessment published in 2009. A Democratic operative who now counsels the President called the report "actionable science" for policymakers and the public to use in forging a way forward. In this image, cars are seen in the aftermath of an embankment collapse in Baltimore as a massive storm system pounded the mid-Atlantic on April 30.
Severe weather: Flood, fire and drought – The report breaks the country down by region and identifies specific threats should climate change continue. Major concerns cited by scientists involved in creating the report include rising sea levels along America's coasts, drought in the Southwest and prolonged fire seasons. In this image from January 16, a wildfire burns in the hills just north of the San Gabriel Valley community of Glendora, California.