作为正在努力增强能源安全及减少碳污染工作的一部分,美国环境保护署(EPA)完成了2013年度4类燃料使用百分比标准,这一标准是美国国会建立的再生燃料标准(RFS)项目的一部分.这些燃料的大多数由美国的农民和种植业者生产,并帮助减少引起气候变化的碳污染.2013年总量及标准要求165.5亿加仑可再生燃料加入美国燃料供应中(9.74%混合).本标准特别要求: As part of its ongoing efforts to enhance energy security and reduce carbon pollution, the U.S. Environmental Protection Agency (EPA) completed the FY2013 fuel use percentage standards as part of the Renewable Fuel Standard (RFS) project established by the U.S. Congress. Most of these fuels are produced by farmers and growers in the United States and help reduce the carbon pollution that causes climate change, with a total of 16.55 billion gallons of renewable fuel added to the United States fuel supply (9.74% mixed) in 2013. This standard special requirement: