虽然近年来机动车排放的有害污染物大幅减少，但机动车的数量一直在稳步增加。

Although recent years have seen substantial reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing.

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我们应该减少私家车的使用，因为私家车排放大量的温室气体。

We should minimize the use of private cars, which emit a large amount of greenhouse gases.

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双方均认为机动车排放量的减少有益于健康和环境，并同意继续支持中国借鉴欧盟排放标准。

They also agreed on the health and environmental benefits arising from reducing emissions from motor vehicles and agreed to continue to support China's introduction of the 'Euro' emission standards.

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Clearly, if I did nothing more, but I took every car, doubled its fuel economy, its emissions would go to 50% of what they are now, no other changes being made.

显然，如果我什么也不做，但是我把没量车的汽油价加倍，汽车废气排放量就会是现在的一半了，别的不会有什么改变。

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