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.
从这份分析报告的角度而言，美国农业部假设，这些原料与可再生燃料标准规定的合格原料基本类似，并且在采用区域性方案来达到目标方面也是必不可少的原料。
For the purposes of this analysis, USDA assumed that these feedstocks were sufficiently similar to those already eligible under the Renewable Fuels Standard and necessary to the regional approach.
他们告诫说，按照环保署目前的方法，现有的豆基生物柴油可能达不到可再生燃料的标准，其它生物柴油可能也将如此。
They warned that under EPA's current methodology, existing soy-based biodiesel may not qualify as a renewable fuel, and other biofuels could follow suit.
他们告诫说，按照环保署目前的方法，现有的豆基生物柴油可能达不到可再生燃料的标准，其它生物柴油可能也将如此。
They warned that under EPA's current methodology, existing soy-based biodiesel may not qualify as a renewable fuel, and other biofuels could follow suit.
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