tailpipe

• Burning a coal - based synthetic fuel rather than gasoline to drive a set distance releases approximately double the carbon dioxide , when one takes into account both tailpipe and synfuels plant emissions
  将汽车排气管与燃料合成厂的排放量合并计算，相同的行车距离，燃烧以煤为主体的合成燃料所排出的二氧化碳，是燃烧汽油的两倍左右。