Friday, June 23, 2006
National Academy of Sciences Confirms Global Warming
According to a new National Academy of Sciences National Research Council report, "Surface Temperature Reconstructions for the Last 2,000 Years," there is sufficient evidence from tree rings, retreating glaciers, and other "proxies" to say with confidence that the last few decades of the 20th century were warmer than any comparable period in the last 400 years. The 155-page report notes that average global surface temperatures in the Northern Hemisphere rose about 1 degree during the 20th Century. The report was requested by Congress (House Science Committee) and was authored by climate scientists Michael Mann, Raymond Bradley and Malcolm Hughes.