Someone (may have been Asimov, not sure) wrote a treatment yonks ago that the Earth could plausibly support as many as 500 billion-with-a-b humans. Of course, this would come at the expense of most other life forms, and would require both a lower standard of living and some significant technological breakthroughs. As I recall, the upshot of the piece was that the planet isn't as much overcrowded as it is mismanaged.
Boru
Boru
‘I can’t be having with this.’ - Esmeralda Weatherwax


