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Unsuitable to date, carbon dioxide has been mainly blamed for global warming. But black carbon particles (commonly known as soot) have also done a fair amount of damage, a recent study indicates. As per its findings, black soot, the dusty by-product of the incomplete combustion of fossil fuels, is responsible for about 25 per cent of the observed rise in global temperatures since 1880.

Researchers from the us National Aeronautical and Space Administration (nasa) conducted the study. James Hansen and Larissa Nazarenko examined the soot's effects on snow albedo

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