Kerosene is the the primary source of light for more than a billion people in developing nations and it is churning out black carbon previously overlooked in greenhouse gas estimates, says a new study. 

Results from field and lab tests found that 7 to 9 percent of the kerosene in wick lamps — used for light in 250-300 million households without electricity — is converted to black carbon when burned. In comparison, only half of 1 percent of the emissions from burning wood is converted to black carbon.

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