烟草税是减少烟草使用最有效的途径，特别是对青少年和穷人而言。

Tobacco taxes are the most effective way to reduce tobacco use, especially among young people and poor people.

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原则上，排放税和可交易排放许可在限制污染上是一样有效的。

In principle, emission taxes and tradable emission permits are equally effective at limiting pollution.

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减少温室气体排放量唯一有效的方式是征收碳排放税。

The only efficient way to cut greenhouse-gas emissions is to impose a carbon tax.

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