Why is there a human population roof?
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There is a maximum number of humans that one could have on the planet, because well, the planet is only so big. Each person takes up space. Space to live, grow food, have fun, what have you. Even if we could pack humans into Amazon boxes and didn’t have to feed them, they’d still take up an amount of space. So the cupboard that is our world can only hold so many.
That being said, the earth can hold A LOT of people (even assuming we aren’t shoving them into Amazon boxes). Earth is far bigger than we tend to comprehend in day to day life. It’s so so big. What is A LOT? Arguably 100s of billions. Arguably 10s of billions. People argue on this point and it changes depending on what you think a human “needs” and how much space you believe to be “available”.
The UNs expected population peak at 10 or 11 billion ish. Much lower than the vast majority of theoretical maximums. Why? People are having less children. All over the world we are making less and less new people each year. In many places, we make people so infrequently that our populations are already dropping. Many places import people from else where, just to have enough young people to do all the work that needs doing.
By the time we’ve reached ~10 billion-ish. The lack of new people being born is probably gonna be a really big issue.
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