Electric cars could cut greenhouse gas emissions if used properly.

如果使用恰当，电动汽车可以减少温室气体的排放。那么人们要怎么使用它们呢？

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The climate accord orders Europe to cut greenhouse gas emissions by 20% by 2020 compared with 1990 levels.

环境协议要求欧洲各国温室气体的排量到2020年与1990年相比同比减少20%。

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

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%。

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Mr.Obama and Democrats in Congress are backing a "cap and trade" bill, which aims to cut greenhouse gas emissions 17 percent by 2020.

VOA: standard.2009.05.30

Under his stewardship, the European Union has adopted an ambitious climate-change program that aims to cut greenhouse gas emissions by 20 percent or more by 2020.

VOA: standard.2009.09.16

Jiang also accused developed nations of abandoning the principle reached in earlier accords, which require them to cut greenhouse gas emissions, but do not make the same requirement of developing countries.

VOA: standard.2009.12.16

His report's key message, one of policy: that governments had to cut greenhouse gas emissions urgently.

BBC: Climate chaos: Transcript

One of the primary benefits of a smart grid is its potential to cut greenhouse gas emissions.

FORBES: The Truth About Risks, Benefits of the Smart Grid

Mr Davey said the advent of shale gas would not weaken the UK's legally binding targets to cut greenhouse gas emissions.

BBC: Gas fracking: Ministers approve shale gas extraction