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Earth is hottest now in at least 400 years, according to study

Report says humans responsible for much of the warming

By John Heilprin, Associated Press
June 22, 2006

WASHINGTON (AP) -- The Earth is the hottest it has been in at least 400 years, probably even longer.

The National Academy of Sciences, reaching that conclusion in a broad review of scientific work requested by Congress, reported Thursday that the "recent warmth is unprecedented for at least the last 400 years and potentially the last several millennia."

A panel of top climate scientists told lawmakers that the Earth is running a fever and that "human activities are responsible for much of the recent warming." Their 155-page report said average global surface temperatures in the Northern Hemisphere rose about 1 degree during the 20th century.

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