A comparative analysis of net CO2 emissions of biofuels suggests differences between energy crops, with average net emission estimates ranging from -42% for sugarcane ethanol to +14% for sunflower biodiesel. Negative percentages suggest that once ILUC estimates have been taken into account, a biofuel produced from a given energy crop emits less GHG than the fuels it replaces; positive percentages suggest it emits more GHG than the fuel it replaces.
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