In nature, populations and organisms hit a natural resistance in population growth models. Environmental factors, etc.
It’s happening environmentally by our way in which we utilize resources. Food production. Glyphosate. Plastics. Endocrinological effects through our own consumerism.
And from a Jungian and Gestalt perspective: it is happening collectively and subconsciously as a whole. Systems work to balance themselves. Look at humanity as an organism.
We look to blame the boogeyman. And there are indeed boogeymen among us. But we as a whole, we are also reflective of our own boogeyman as a result of self imposed consequence. Life on planet earth. Change is Sisyphean.