Climate modeling has incorporated sulfate aerosols produced by human activity. Those particles reflect solar energy back into space, thus cooling the planet. The significant effect of the sulfate particles was confirmed by the 1991 Mount Pinatubo eruption, which threw vast amounts of particles (an estimated 20 million tons, much more than the combined total of all the cars ever in existence have produced) into the upper atmosphere, leading to a measurable cooling of the earth for the next two years. Sulfate aerosols not only reflect energy directly away from the globe but act to condense water vapor into clouds, which also reflect incoming solar radiation away from the earth. The net effect is to reduce the amount of warming from manmade sources. Incorporating the effects of aerosols into the models has led to better predictions of past temperature changes; more important, it has reduced significantly the forecast temperatures and sea level rises resulting from climate changes. (Attribution: Thomas Moore, Climate of Fear, and Rush Limbaugh, EIB.)
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