Climate change poses many challenges that affect society and the natural world. With these challenges, however, come opportunities to respond. By taking steps t

Summarizes the science of climate change and impacts on the United States, for the public and policymakers.

As climate has warmed over recent years, a new pattern of more frequent and more intense weather events has unfolded across the globe. Climate models simulate s

Climate change is occurring. It is very likely caused by the emission of greenhouse gases from human activities, and poses significant risks for a range of huma

Climate change can reasonably be expected to increase the frequency and intensity of a variety of potentially disruptive environmental events-slowly at first, b