To cross our own tipping point and decide to embrace a future carbon-free world.

超越我们自己的临界点，坚决拥抱未来的无碳世界。

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That is a sobering thought in a world ready to re-embrace relatively carbon-free nuclear power.

那在一个准备重新回归相关无碳核动力的世界里是一种清醒的认识。

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By their very nature, biofuels cannot be carbon-free because carbon is essential to life on Earth.

就生物燃料的性质而言，它还是会产生出碳质物，因为这种碳对地球上的生物是极有必要的。

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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

In the effort to mitigate carbon emissions and climate change, sources of carbon-free renewable energy are sought, particularly wind power.

FORBES: Researchers Warn Of Climatic Consequences To Harvesting Wind Energy On Mass Scale