Facts in the controversial US biofuels debate

The US drought and shrinking corn yields have again seen criticism dished out to the world's main biofuel – US ethanol – but is the criticism warranted?

The US ethanol industry is right to complain that its consumption of corn is routinely exaggerated, by opponents of biofuel and in wider commentary, but it still consumes enough to make a minimum blending mandate look vulnerable.

A US drought and shrinking corn yields have thrown a focus once more on the role of biofuels, four years after a rise in grain prices led to a food-versus-fuel debate and riots in developing countries.

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