I think this is the main takeaway. If we lived on earth 50 million years ago when there were no ice caps, we would still thrive. But we would be living vey diff

I think this is the main takeaway. If we lived on earth 50 million years ago when there were no ice caps, we would still thrive. But we would be living vey differently, in different areas, and dependent on different ecosystems. Such sudden change is the problem.