Clearing tropical forests for agriculture is estimated to produce 17% of the world's greenhouse gas emissions - more than the global transport system.

砍伐热带森林转型农业生产这种行径，预计所产生的温室气体将占全球排放量的17%——这超过了全球整个交通系统的排放量。

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But two copies of the "met" form produce a weaker version of COMT that is not so good at clearing away the chemicals.

BBC: Gene controls pain threshold