In two minutes and 39 seconds, the incomparable Isaac Asimov explains the greenhouse effect and tells why he has been warning about it for 20 years. Of course, Azimov has been dead almost 20 years (since April 6, 1992); this video (which we found courtesy of Peter Sinclair from Climate Denial Crock of the Week) was recorded in 1989.
How much has changed since. How much, woefully, has not.
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