What do you think would happen if a chicken in an egg, which had exhausted its resources within the egg, decided that rather than using its powerful body mass to break out of the egg, it would just cut down its body mass, to try to consume less within the egg?
That wouldn't be a very clever chicken, it seems to me.
All we need to do, to change our human load from something negative, to something positive, is start using the energy of the sun, like all of nature does. After that, then we will understand why we can never have enough humans, at least until our species develops to adulthood.