Soot is defined as the particulate matter released by the burning of fossil fuels, mainly coal. It is often a black substance that is deemed harmful because the dark particles cause warming by absorbing heat in the air. On a grand scale, black carbon also quickens the melting of glaciers. It is now listed as the number two human contributor to climate change.
http://theenergycollective.com/ecskris/173451/soot-pollution-climate-c
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