Even as we humans count on forests to soak up a good share of the carbon dioxide we produce, we are threatening their ability to do so.

即使我们指望森林吸收很大一部分人类生产的二氧化碳，但森林的吸收能力正在遭受人类的威胁。

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But critics say that "clean coal" is a pipe dream, an oxymoron in terms of the carbon emissions that count most toward climate change.

然而批评者说，“清洁煤”只是一种幻想，由于二氧化碳的排放是引起气候变化的关键，因此“清洁煤”是一个自相矛盾的概念。

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So overall (and with the huge proviso that you do not count the fossil fuel used to farm the stuff) biofuels are carbon-neutral.

因此，总体来讲，生物燃料是属于碳中性的，但条件是人们不会去计算制造生物燃料所要耗费的化石燃料。

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Because an EOR system using atmospheric carbon dioxide removes, rather than emits, carbon dioxide, the fuel it produces would count as very low carbon indeed under California's rules.

ECONOMIST: Combating climate change