The problem is that we cannot observe what a climate without the presence of human activity looks like, since we can only observe the current state of the climate.
然而问题是，我们无法实际观察不受人类活动影响的气候会是如何，因为我们只能观察目前的气候状况。
The problem is that we cannot observe what a climate without the presence of human activity looks like, since we can only observe the current state of the climate.
然而问题是，我们无法实际观察不受人类活动影响的气候会是如何，因为我们只能观察目前的气候状况。
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