We once thought that 100 million would be unsustainable. We have been able to improve food production a lot. And we are still not producing food optimally most places and still waste a lot of food. So even with current technology, just more of it, we can likely maintain a population ten times the current number. And that is before we consider new technologies which are under development. Similarly in other areas other then food. Current technology is good enough, we just need to build more infrastructure and change our culture and economy to be more sustainable.
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