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National Geographic: Growing crops to make biofuels may accelerate global warming, not slow down its effects, a new study says. When farmers clear native ecosystems such as forests or grasslands to grow crops, this gives off substantial amounts of carbon dioxide, the primary greenhouse gas that fuels climate change. Biofuels such as ethanol from corn and biodiesel from palm oil typically start out with a "carbon debt." Before these biofuels could reduce individual carbon dioxide ... Read »