尽管联邦的碳排放总量管制与排放交易系统可能会是一个冒险，但我们可以考察一下这一理念在各州是如何发挥作用的，有很多州的作法已经遥遥领先于华盛顿。

Though a federal cap-and-trade system for carbon would largely be a foray into the unknown, we can examine how the idea is working in the states, many of which are far ahead of Washington.

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去年，众议院通过了总量管制与排放交易法案，该法案实施后，到2020年，温室气体排放量将比2005年削减17%。

Last year, the house passed a cap-and-trade bill that would have cut greenhouse gas emissions 17 percent below 2005 levels by 2020.

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最好的是设定一项碳排放税，此税相比“总量管制和排放交易体系”更不容易受商业游说的影响。

Best of all, set a carbon tax, which is less susceptible to capture by business lobbies than is a cap-and-trade system.

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