Anne Schwarz said: "The problem is, where do those people go? There are so many densly populated places that are not self sustainable."
Sure, the maximal productivity (sustainability) of a given region is certainly a significant factor. I think there is a more fundamental (and more immediate) consideration.
Wastefulness. Sounds silly perhaps but most people today lack the ability to frugal with their existing resources. Frugality doesn't mean to live 'poorly' but simply within one's means. Maximising the use of available resources and redirecting excess to others (or storage).
Mike Elvin
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