Uhmmm you know we literally cannot handle anymore human beings on this planet right? No matter how much we deny it, global warming is real. The only difference between the common people and a scientist, is that the scientists of our world are able to view the evidence and try to help us avoid such a disastrous fate. Whereas we simply presume everything will be simply fine just because they are right now. What I am trying to say is, if what you proposed were a good idea humans would have come up with it already. But my guess is, the most knowledgeable humans that exist on this world, probably know best. And my guess is they arent really bluffing when it comes to terms of human population and how it directly correlates with the exponential rise in atmospheric temps, pollution, and the depletion of natural and necessary resources.