然后Google利用这些可以在市场上交易的期货性质的许可证，来抵消自身运作中的碳排放，进而保守住碳中立的承诺。
Google can then use these RECs (which are commodities that can be traded on markets) to offset its carbon emissions from its operations, and help with its pledge to become carbon neutral.
科学家们同时担心，随着二氧化碳排放量的增加，海洋将会吸收更多的温室气体，进而改变海水的化学性质。
Scientists are also worried that, as carbon dioxide emissions rise, the ocean will absorb greater amounts of the greenhouse gas, shifting the chemistry of seawater.
这些燃料因其物理、化学性质不同，所表现出来的动力性能、排放性能、经济性能和其他方面（如存储、运输、原料等）也有很大区别。
The different physical and chemical properties cause the differences of power property, emission property, economic property and other aspects, such as storage, transportation and raw materials.
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