January 12, 2000

Running Time: 00:48:00

Format: RealAudio (Requires free RealPlayer)

Despite differences in temperature data, strong evidence exists to show that the warming of the Earth's surface is "undoubtedly real," and that surface temperatures in the past two decades have risen at a rate substantially greater than average for the past 100 years, says a new report by the National Research Council of the National Academies.

Edward H. Shortliffe, Professor and Chair, Department of Medical Informatics, Columbia University.