Counting the cost of global warming is hard because no one really knows how much to attribute to climate change and how much to other factors.

计算全球变暖的成本并不是轻而易举就能完成的，因为人们无法得知，这其中到底有多少源于气候变化，又有多少来自其他因素。

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Counting the cost of global warming is hard because no one really knows how much to attribute to climate change and how much to other factors.

计算全球变暖的成本并不是轻而易举就能完成的，因为人们无法得知，这其中到底有多少源于气候变化，又有多少来自其他因素。

youdao