One metric that we custom developed for this implementation was the Carbon Efficiency metric.

我们为这个实现开发的一个指标是碳效率(Carbon Efficiency)。

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The European Happy Planet Index used carbon efficiency, life satisfaction and life expectancy to rate the countries.

此项“欧洲快乐星球指数”主要是综合碳效率、人民的生活满意度及预期寿命三个指标对这些国家（country）进行评分成。

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Finally, It t uses the method of mathematical statistics and questionnaire analysis tostudy other related influencing factors of the hotel carbon efficiency and carbonemissions.

最后，利用数学统计方法和问卷调查分析研究其它相关影响因素对酒店碳排放效率和碳排放量的影响。

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He said Russia will none-the-less continue to push for domestic energy efficiency and cuts in carbon emissions.

VOA: standard.2009.12.25

Alaska Airlines came in second with three leafs, scoring well in recycling, building design and carbon efficiency.

BBC: How eco is your airline?

Each car was scored for its performance in terms of air pollution, fuel efficiency and carbon footprint ratings.

FORBES: Magazine Article

"It has been suggested to us that some of the claims about fuel efficiency and carbon issues are fundamentally deceiving, " he said.

CNN: It's not easy being green