A couple of scientists “did the math” and figured out what the optimal earth population should be, given factors like natural resources, food & water supply, etc.
They note that while they have a number - and we have exceeded it - the other factor is that we have technology which allows us to extend beyond the resource limits.
That said… their optimal number for population is about 2.5 billion. Our current earth population is around 8.3 billion. Which is a significant difference. They note that this is one reason we’re seeing problems with our ability to feed everyone.
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