Congress passed a renewable fuels standard in 2007 that quadrupled the requirement for blending ethanol and other biofuels into petrol supplies, to 36 billion gallons by 2022.

 
  • 2007年国会确定了可持续能源的标准,到2022年,生物能源的供求将翻4倍,达到360亿加仑。
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