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In page Food vs. fuel:

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Food surpluses exist in many developed countries. For example, the UK wheat surplus was around 2 million tonnes in 2005.[7] This surplus alone could produce sufficient bioethanol to replace around 2.5% of the UK's petroleum consumption, without requiring any increase in wheat cultivation or reduction in food supply or exports. However, above a few percent,[8] there would be direct competition between first generation biofuel production and food production. This is one reason why many view second-generation biofuels as increasingly important.[citation needed]