People have known how to make ethanol since the dawn of civilisation, if not before.
如果不能说在人类文明开始之前人们就学会制造乙醇，那这也是人类文明刚刚出现就有的事了。
This would mean humans have been changing global climate since well before the dawn of civilisation.
这就意味着早在文明开始前，人类就已经在改变全球气候了。
This would mean humans have been changing global climate since well before the dawn of civilisation.
这就意味着早在文明开始前，人类就已经在改变全球气候了。
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