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.

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 is occurring, is caused largely by human activities, and poses significant risks for-and in many cases is already affecting-a broad range of huma