"Producing tens of millions of tonnes of biofuel requires a large increase in agricultural output, or a correspondingly large reduction in the amount of food people eat. If the extra agricultural production comes from clearing land to expand farms, either in Europe itself or further afield in countries like Brazil or Indonesia, it will cause the loss of carbon stored in the soil and in biomass (grasses, shrubs, trees and so forth) on the land, emitted as carbon dioxide."
http://www.euractiv.com/science-policymaking/science-sake-eu-legislate-biofue-analysis-529495
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