“The Earths climate is changing. The Fourth Assessment Report (AR4) from the Intergovernmental Panel on Climate Change (IPCC) offers the most comprehensive and up-to-date scientific assessment of this issue, stating with very high confidence that human activities such as fossil fuel burning and deforestation have altered the global climate. Climate change signals are also manifesting themselves in U.S. ecosystems. U.S. temperature and precipitation records show that the country has become warmer and wetter during the last 100 years, but there is considerable regional variation within this overall picture. Parts of the South have cooled, while northern regions have warmed. Many eastern and southern areas now receive more precipitation than 100 years ago, while other areas, especially in the Southwest, receive less.”
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