我们应该采取措施来减少污染。
我认为我们应该采取措施来减少污染。
其目的是鼓励减排成本低的公司采取措施减少排放,而减排成本高的公司通过购买排污许可的方式来减少污染。
The intention is to encourage firms that find it cheap to cut emissions to do so, while allowing those with no easy means to pollute less to buy permits instead.
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