The stresses associated with climate change are expected to be felt keenly as human population grows to a projected 9 billion by the middle of this century, inc

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

The stresses associated with climate change are expected to be felt keenly as human population grows to a projected 9 billion by the middle of this century, inc

The climate record for the past 100,000 years clearly indicates that the climate system has undergone periodic-and often extreme-shifts, sometimes in as little

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