We can group employees by how they emit carbon in the exercise of their functions as

我们根据雇员执行任务时带来碳排放的方式对其进行分组

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Conversely, when forests are cleared or die back because of global warming, they emit carbon.

相反，森林因为全球变暖遭到毁灭或者枯萎时，就会释放碳。

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The climate change we are hastening could one day leave us with forests that emit more carbon than they absorb.

因人类而不断加剧的气候变化或许终有一日让森林的碳排放量超过其吸收量。

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most sweeping emissions trading system companies would have to buy permits for every ton of carbon they emit, a system designed to provide financial incentives for those that reduce their pollution.

VOA: standard.2009.05.03

Conversely, when forests are cleared or die back because of global warming, they emit carbon.

ECONOMIST: A special report on forests

The new research also suggests that as trees die, they actually emit more carbon than they absorb.

CNN: Global warming threatens forests, study says

One is how much energy they use to produce that economic growth, and the other part is how much carbon they emit to get there.

NPR: China Reveals Goals To Cut Carbon Emissions