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The difference with our current dilemma is the amazing speed with which it is occurring. Yes, climates have changed drastically in the past, but many life forms had the time necessary to evolve and deal with it, or migrate because it took such a very long time to happen. This time it's fast, really really fast. To you and I it may seem too slow to notice, but in geologic terms it's happening incredibly fast.
The difference with our current dilemma is the amazing speed with which it is occurring. Yes, climates have changed drastically in the past, but many life forms had the time necessary to evolve and deal with it, or migrate because it took such a very long time to happen. This time it's fast, really really fast. To you and I it may seem too slow to notice, but in geologic terms it's happening incredibly fast.