高铁的出现并没有减少国内航班的耗油量，也没有减少飞行器的二氧化碳的年排放量。
HSR does not reduce the fuel consumption of domestic aviation or reduce annual carbon emissions from aircraft.
一种比二氧化碳导致地球变暖效应高17,000倍的温室气体，其排放量比之前估计的至少高出4倍。
Emissions of a greenhouse gas that has 17, 000 times the planet-warming capacity of carbon dioxide are at least four times higher than had been previously estimated.
在他们2006年下线的汽车中，燃料效率高的小汽车占了大部分，平均的二氧化碳排放量为142-147 g/km。
In 2006 their fleets, heavily biased towards fuel-efficient small cars, averaged 142-147g/km.
在他们2006年下线的汽车中，燃料效率高的小汽车占了大部分，平均的二氧化碳排放量为142-147 g/km。
In 2006 their fleets, heavily biased towards fuel-efficient small cars, averaged 142-147g/km.
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