根据皮特森国际经济研究所(位于华盛顿哥伦比亚特区)的威廉姆·克莱恩的研究，世界粮食至少4%被用于制造酒精燃料。
According to William Cline of the Peterson Institute for International Economics in Washington, DC, at least 4% of the world's grain is used to make ethanol for fuel.
但供应不可能在转瞬之间制造出来，特别是在曾用于粮食生产的农田如今往往被用于制造生物燃料的情况下。
But supply cannot be created at the flick of a switch, particularly when agricultural land once used for food is now often being used for biofuels.
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