The second problem with Hansen's prospective coal ban: scale.

汉森预想的禁煤令还有第二个问题：改变的规模。

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Cleaning coal of its greenhouse gas byproduct is a widely discussed idea but at this point unavailable at a commercial scale.

清除煤燃烧时释放的温室气体早就成为人们谈论的话题，但是直到目前为止还无法达到商业规模。

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There are two key problems with Hansen's argument against coal: cost and scale.

汉森反对使用煤炭的论点存在以下两个关键问题：这么做的花费和改变的规模。

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Ohio-based American Electric Power, the largest consumer of coal in the U.S., is trying to build the country's first super-efficient commercial-scale coal gasification plant.

FORBES: Magazine Article

And some additional, much less happy news from Australia, as Unesco and environmentalists warn that climate change and large-scale coal mining may lead to the wholesale destruction of the Great Barrier Reef.

BBC: In brief: Unearthing Australia's secret history

But although a number of other firms will soon join the race with pilot projects, no full-scale CCS coal plant has yet been commissioned.

BBC: NEWS | Science/Nature | Germany leads 'clean coal' pilot