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Everyone has heard of global warming, but a lesser-known man-made phenomenon has been nearly as powerful at affecting Earth's climate. A look at global dimming, created by soot and pollution reflecting the sun's rays and surprisingly helping to offset global warming's catastrophic advance.
NOVA
Season 33
16
April 18, 2006
55 minutes
Kathryn Walker
Narrator
Duncan Copp
Director
David Sington
Producer