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
‘But it does me no injury for my neighbour to say there are twenty gods or no gods. It neither picks my pocket nor breaks my leg.’ - Thomas Jefferson
