碳排放税将为每单位二氧化碳设置一个具体的成本，并因此为碳确定一个清晰的成本。
A carbon tax would set a specific cost per unit of carbon dioxide, thus establishing a clear cost for carbon.
每单位体重，牛产生的二氧化碳最少。
Cattle produced the least carbon dioxide per unit of body mass.
中国在能源利用效率方面远远低于欧盟等发达国家，也有进一步降低单位GDP二氧化碳排放量的现实需要。
China's energy utilization efficiency is far lower than the EU and other developed countries, and China needs to further reduce carbon dioxide emissions per unit of GDP.
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