汽车消耗了美国一半的石油，导致了美国约半数的城市污染和四分之一的温室气体。

Cars account for half the oil consumed in the U.S., about half the urban pollution and one fourth the greenhouse gases.

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汽车耗油量占美国石油消耗量的一半。

Cars account for half the oil consumed in the U.S.

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因为供应过剩和需求下降，煤炭价格也很低，尤其是消耗了全球一半煤炭的中国的需求下降。

Coal prices also are low, owing to over-supply and the scaling-down of demand, especially from China, which burns half of the world's coal.

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