Oh, I have no doubt about nature taking care of things. It's done it before. Dinosaurs ruled the earth for 500 million years. Where are they now and how did they die? Peacefully? A few species managed to survive, fortunately our ancestors did. But what options do you suggest humans can implemenet to lower the growth rate to zero %? To us that would be unnatural. In the long run there is no escape from the mathematics involved.