Fossil fuels may be doing an even more efficient job of warming the planet than we thought. A new study shows that black carbon generated by fossil fuels seems to warm the planet more than other sources, and sulfates generated by burning cheaper fuels help the black carbon absorb even more energy. The scientists who authored the paper note that policies will likely need to tamp down on both substances in order to make a dent in the rate of global warming.

Researchers have long considered black carbon a culprit behind the increasingly warm atmosphere, as it holds incoming heat rather than reflecting it. They haven't been able to decisively point fingers, though, because it's difficult to pinpoint how much warming the black carbon causes. The source of the carbon seemed to play an important role, as did the ambient amount of other substances, like sulfates.

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