Why is there a human population roof?
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It’s a combination of:
– how many resources do we have ?
– how do we use the resources (including efficiency, recycling, etc) ?
– what standard of living do we have ?
– how many of us are there ?
So, you can pick various combinations of those things.
If you wanted to figure out an absolute maximum possible number of humans on Earth, pick most efficient use of resources and lowest standard of living. So maybe pack everyone into tiny living units and feed us IV nutrients derived from growing algae or something. Probably could support many trillions of humans that way.
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