NOVA : 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.

Starring:

Jay O Sanders, Lance Lewman, Liev Schreiber, Neil Ross, Stacy Keach, Will Lyman

Genre:

Documentary, Biography