2005年8月布什新签署的《国家能源政策法案》中制订了可再生燃料标准（Renewable Fuel Standard，RFS），RFS明确指出必须在汽油中加入特定数目可再生燃料且每年将递增。
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根据可再生燃料标准，乙醇及其它可再生燃料的生命周期温室气体排放量必须比汽油低20%。
To qualify under the RFS, ethanol and other fuels would have to reduce life-cycle greenhouse gas emissions by 20 percent compared with gasoline.
就目前而言，温室气体排放量的计算方式正使得人们越来越担心豆基生物柴油可能达不到可再生燃料标准。
As it is, concerns are growing that soybean-based biodiesel might be disqualified because of a way to calculate for greenhouse gases.
下文的分析将提出能够达到可再生燃料标准规定目标的一种设想情境，它以美国农业部对地区原料可用性及其它要素的分析作为依据。
The analysis presented below presents one scenario by which the RFS targets could be met. It is based on a USDA analysis of regional feedstock availability and other factors.
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