Mr. Obama's plan to curb carbon dioxide emissions, though necessary, will be far from cost-free, whatever his sunny speeches on the subject might suggest.

尽管奥巴马的二氧化碳减排计划是必要的，但这远不是免费的，无论他在这个问题上发表的充满希望的演讲可能会暗示什么。

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Mr. Obama's plan to curb carbon dioxide emissions, though necessary, will be far from cost free, whatever his sunny speeches on the subject might suggest.

尽管奥巴马的二氧化碳减排计划是必要的，但无论他在这个问题上发表的充满希望的演讲可能会暗示什么，这远不是免费的。

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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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In Europe's cap-and-trade scheme, the European Union allocated emissions allowances for free to emitters of carbon dioxide or other greenhouse gases.

FORBES: The Climate Change Trap

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

Sir David King, Tony Blair's chief scientist, recently argued that one further generation of nuclear power stations is needed (in Britain at least) to buy time, in order to keep down emissions of carbon dioxide, the chief greenhouse gas, while new carbon-free non-nuclear technologies are developed.

ECONOMIST: Nuclear power