市场上已经有很多替代燃料汽车，其动力来源从太阳能到天然气无所不包。

Already there are many alternative fuel vehicles on the market, powered by anything from solar power to natural gas.

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然而，在欧洲使用天然气燃料的汽车少的可笑。

Yet in Europe use of natural-gas vehicles is derisory.

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一些人甚至梦想用天然气制造氢，用以提供燃料电池汽车的动力，但支持者们承认这个方向上还有很长的路要走。

Some even dream of using natural gas to make hydrogen which would power fuel-cell cars, though advocates admit that these are still a long way off.

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