Nature doesn’t fight. It balances. If you introduce wolves into a population of elk, the wolf population never increases far beyond the numbers of elk. One naturally predates the other and both species co-exist in balance.
It’s in this co-existence that wolves change the grazing behavior of elk which in turn can change the flow of rivers. Have you heard such a thing? That wolves can affect the course of a river?
It’s amazing what little changes in aggregate can achieve. The take away is: nature tends toward balance and changes at the micro can affect the macro. That’s what we are about to experience as a species.