来自缔约国的企业必须降低温室气体排放量。

Companies from signatory nations are committed to capping their greenhouse-gas emissions.

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碳税能提高相同的数量，而且可以进一步帮助英国降低温室气体的排放，如果设计合理的话。

A carbon tax could raise a similar amount and, properly designed, could have the further merit of helping Britain to lower its emissions of greenhouse gases.

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虽然一些生物燃料原料(如糖)的使用可以明显降低温室气体的排放，但对于许多其他原料而言，情况并非如此。

While some biofuel feedstocks, such as sugar, can generate significantly lower greenhouse gas emissions, this is not the case for many other feedstocks.

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