The European Commission's carbon tax plan will only exempt airplanes that have an annual carbon emission of less than 10 thousand tons.
欧盟规定，只有每年碳排放量低于1万吨的航空公司，才可以免收这笔费用。
Not only because they prevent deforestation, but they actually use less energy, and have a lower carbon emission once everything is taken into account.
它不仅能防止森林砍伐，使用的能源更少，考虑到前后因素，其二氧化碳排放量也更低。
Is carbon exchange market really an effective mechanism encouraging business organizations with less emission?
碳交易所真的是一种鼓励企业减少碳排放的有效机制么？
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