The chief of the Opec oil cartel has warned that investing in biofuels could push oil prices "through the roof", the Financial Times has reported.
Opec secretary general Abdalla El-Badri said moves to use biofuels would make his members consider cutting investment in new oil production, the FT said.
President Bush says the US will cut petrol use by 20% in 10 years, partly through increased use of biofuels.
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