Bump
I wonder what the "carrying capacity" of China or India is, analyzed using this methodology.
Population causes a load on the environment, and it becomes more challenging to maintain quality of life and standard of living, but people are also economic activity, power, and not least importantly a blessing from God.
But we're not catching up that fast. We just hit 300. Although some very overly optimistic types forecast 400 later this century I remain skeptical, and suspect we'll actually go the way of Europe. Even the immigrants become dinks or single childers after a single generation. Plus no way open borders will continue more than a week after the next big attack.