由于生物柴油的原料都是来自与植物，而植物本身就会转化为二氧化碳，所以这样的话使用生物燃料的碳排放相对来讲比使用化石燃料的碳排放要小。
Because biodiesels can be made from materials derived from plants, which use carbon dioxide to grow, they potentially have a much lower carbon footprint than petroleum-based fuels.
麦当劳用来炸薯条和鸡块的油，不久还将成为其送货卡车的燃料。这家快餐连锁公司将开始把烹饪用油转化为生物柴油。
The oils that sizzle McDonald's fries and chicken nuggets will soon also stoke its trucks, as the fast food chain starts converting its cooking oil into biodiesel.
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