You left out the part that happens when the populations get limited by their environment. It's not pleasant for the species... And I don't think it's fair to s

You left out the part that happens when the populations get limited by their environment. It's not pleasant for the species... And I don't think it's fair to say that we can't possibly limit our population... strong social safety nets reduce the need for big families, and freely available contraception makes it feasible to limit family sizes.