Study says Earth's temp at 400-year high
news.yahoo.com
WASHINGTON - 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 heating up 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.
This is shown in boreholes, retreating glaciers and other evidence found in nature, said Gerald North, a geosciences professor at Texas A&M University who chaired the academy's panel.
The report was requested in November by the chairman of the House Science Committee, Rep. Sherwood Boehlert (news, bio, voting record), R-N.Y., to address naysayers who question whether global warming is a major threat.
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