毫无疑问人类对地球上的气候造成了影响。
There is little doubt that man has had an impact on the Earth's climate.
所以我们一直在讨论人类活动对气候影响的理论。
So we have been talking about theories that deal with the effects of human activity on the climate.
一个世纪前，化学家斯万特·阿伦尼乌斯就人类影响地球气候的可能性展开了最早的辩论之一。
A century ago, chemist Svante Arrhenius started one of the first debates over the potential for humans to influence the planet's climate.
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