> There's a calculable limit to the population an area of land can sustain. (Yes, some agricultural practices can mitigate that, but that should also be weighed against culture and history, and how much change is acceptable.)

Ah yes, folks fighting the good Malthusian fight since 1798, and yet to see a win. LoL. [1]

[1] https://en.wikipedia.org/wiki/Malthusianism#Criticism