Soot is second largest man-made contributor to global warming.
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An international team of researchers posits that black carbon is the second largest man-made contributor to global warming. Researchers also think that its influence on climate has been greatly underestimated.
Researchers believe that the direct influence of black carbon, or soot, on climate could be about twice previous estimates. Keeping in mind all the ways it can affect climate, black carbon is thought to have a warming effect of about 1.1 Watts per square meter, which is approximately two thirds of the effect of the largest man-made contributor to global warming, carbon dioxide.