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Global dimming is the hypothesised gradual reduction in the amount of sunlight reaching the Earth's surface measured since the 1950s, as first reported by Atsumu Ohmura in 1989.
*SNIP* While air pollution is not a good thing, some scientists think it may, in the long run, actually help counteract global warming. The pollution particles in the atmosphere can reflect sunlight and help create more cloud cover, which may cause an overall reduction in the amount of sun, and thus heat, that reaches the surface.
Adding to the confusion is the fact that satellite images of clouds seem to suggest that the skies have become slightly clearer since the start of the 1990s, and this has been accompanied by a sharp upturn in temperature.
This is a critical question -- if the Global Dimming has been caused by pollution, efforts to clean up the atmosphere may actually speed up Global Warming
Apparently, this theory of reduced pollution = more warming is being discussed in several places. I think global dimming will be heard about more and more in the future. Certainly, it will help to heat up the global warming controversy.