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The idea behind global dimming is that pollution – particles in the air – are blocking sunlight and causing cooling. The documentary, originally produced for the British Broadcasting Company’s well-regarded “Horizons” specials, points out that there are scientists who believe that global warming may be slowed by global dimming.
“It is possible that the solar dimming resulting from buildup of particulate pollutants has partially offset the rate of warming attributed to greenhouse gas increases,” Travis said. “This might lead some to speculate that this is a ‘good’ thing but clearly it’s never a good idea to try and reduce one problem through creation of a new one. The numerous respiratory health risks from buildup of particulate pollutants alone justify the need to deal with this problem as soon as possible.”