Study finds fossil fuels are main source of carbon in the Arctic. Five years of testing at sites across the Arctic tracked seasonal fluctuations and sources of black carbon, or soot, which contributes to global warming and ice melt.

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Study finds fossil fuels are main source of carbon in the Arctic. Five years of testing at sites across the Arctic tracked seasonal fluctuations and sources of black carbon, or soot, which contributes to global warming and ice melt.