Unlike such fossil fuels, which release climate-changing carbon dioxide when burnt, nuclear power is "carbon free".

核能与矿物燃料不同，完全没有碳元素，不会在燃烧时释放改变大气的二氧化碳。

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Though their power is renewable and, on the face of it, carbon-free, there are lots of bad things about them, too.

尽管它产生的能源是可再生的，并且在表面上是无碳排放的，但还是有很多不好的方面。

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And if cars switch from oil to electricity, the demand for power generated from carbon-free sources will increase still further.

如果汽车由石油驱动改为电驱动的话，对于碳素燃料所产生的电能的需求将会增长许多。

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But if gas is plentiful and cheap enough to replace carbon-rich coal, it will also be in a position to replace carbon-free nuclear and renewables, and in doing so more carbon dioxide will be emitted than would otherwise be the case.

ECONOMIST: Natural gas

Yet for all the subsidies lavished on automakers in this carbon-free niche, none have made any serious headway.

FORBES: China's Auto Industry Eyes Subsidies For Electric, Hybrid Cars

Shale gas is also likely to divert investment in Britain from pricier but carbon-free nuclear and renewable-energy sources.

ECONOMIST: Shale gas will not solve Britain��s energy problems