生物燃料专家认为目前美国的乙醇大部分是玉米制造而成，这很难减少温室气体的排放。
Biofuel critics say current us ethanol, which is mostly made from corn, does little to reduce greenhouse gas emissions.
不同来源的东西都具备生产生物柴油和可再生柴油的潜力，”明尼苏达大学的生物燃料专家道格拉斯· 蒂凡尼说。
"You've got all these different sources and they all have they potential to be made into biodiesel or renewable diesel," said Douglas Tiffany, a biofuels expert at the University of Minnesota.
能源和野生动物专家们纷纷表达了对生物燃料的担忧，欧盟去年也似乎重新考虑了其立场。
Energy and wildlife experts have expressed concerns about biofuels and the EU last year appeared to reconsider its position.
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