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Published online 26 January 2006 | Nature | doi:10.1038/news060123-13
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Biofuels get mixed review
Ethanol does well on efficiency, but only so-so for the environment.
Ethanol fuel from plants may be more efficient that petrol, but for now it offers only marginal environmental benefits. That's the message from scientists who have analysed exactly how much energy goes into making such biofuels, and how much carbon dioxide they emit as they power your car.
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