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Page last updated at 08:23 GMT, Wednesday, 13 April 2011 09:23 UK

Biofuels 'drive environmental problems'

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Biofuels were once thought to be the answer to global warming, but have actually harmed the environment they were supposed to protect, according to research by the Nuffield Council on Bioethics.

One of its authors, Professor Ottoline Leyser of Cambridge University, outlines their conclusions.


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