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 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

Climate is changing, forced out of the range of the past million years by levels of carbon dioxide and other greenhouse gases not seen in the Earth's atmosphere

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

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