War, plague no match for deforestation in driving CO2 buildup

Thursday, January 20, 2011 - 14:32 in Earth & Climate

Genghis Khan and his Mongol hordes had an impact on the global carbon cycle as big as today's annual demand for gasoline. The Black Death, on the other hand, came and went too quickly for it to cause much of a blip in the global carbon budget. Dwarfing both of these events, however, has been the historical trend towards increasing deforestation as crop and pasture lands expanded to feed growing human populations.

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