You can make your flights carbon neutral by planting trees to make up for the greenhouse gas emissions.

你可以通过种树抵消温室气体排放，这样你的飞行就可以做到碳中和。

《柯林斯英汉双解大词典》

Pricing carbon proves the most economical way to reduce greenhouse gas emissions.

碳定价被证明是减少温室气体排放最经济的方式。

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Taxes can also be an important tool for environmental protection, and many economists say taxing carbon would be the best way to reduce greenhouse gas emissions.

税收也可以作为环境保护的一个重要工具。许多经济学家认为，征收碳税会是减少温室气体排放的最佳途径。

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Greenhouse gas emissions, such as carbon dioxide, are created in part by burning oil and coal for transportation and electricity.

VOA: special.2009.12.26

Climatologists say that greenhouse gas emissions, such as carbon dioxide from burning oil and coal, contribute significantly to global warming.

VOA: standard.2009.11.09

Greenhouse gas emissions such as carbon dioxide are thought to be a major cause behind rising temperatures that have lead to extreme weather and food shortages.

VOA: standard.2009.09.28

"At this field site, we are very lucky to have two key bioenergy crops growing side-by-side, which is allowing us to make a comparison of their effects on soil carbon and greenhouse gas emissions from the soil, " he told BBC News.

BBC: Measuring bioenergy crops' carbon footprint credentials

Governor Arnold Schwarzenegger, defying opposition from business lobbies and some fellow Republicans, agreed with Democrats who control the California legislature to cap the state's greenhouse-gas emissions and reduce carbon-dioxide emissions by 25% by 2020.

ECONOMIST: Politics this week

Most studies to date suggest that shale-gas wells may lead to slightly higher carbon-dioxide emissions than conventional-gas ones because more wells are needed and fracking requires lots of power from diesel motors.

ECONOMIST: Shale gas��s poor image in Europe is largely unjustified