>> Modern society would collapse if change to a state of the world that you describe would quickly come.

That means the modern society is not sustainable and cannot adapt to long-term changes. It's like those cities, where all traffic and power supply would be affected for every rain. That's not adaptation. That's just living precariously on greed and assumptions.

The drastic changes, if any, themselves would be purely man-made, not like asteroids that killed dinosaurs. A proper evolution or adaptation would not have drastic changes. Changes would be gradual in synch with the pace of biological evolution.