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Climate change & supply security define the search for ecological & economically sustainable energy sources. Biofuels appear to achieve both objectives equally, yet doubts have increasingly been raised about whether these are truly a sustainable alternative to fossil fuels. CO2 emissions from production & distribution as well as use must be considered, & numerous sustainability problems related to biodiversity, food supplies, & environmental & social protection can emerge along the supply chain. These problems could be reduced through use of a certification program for biofuels that encompasses the entire supply chain. Figures. Adapted from the source document.