[bookofsand]

Subsistence agriculture? Slums? Manhattan hyper density?

Cuba (2.68), Tunisia (2.60), Ecuador (2.43), Egypt (2.32), Brazil (2.25), Vietnam (2.20)?

[in_a_society]

None of that sounds particularly attractive. I would rather use nuclear, wind, or solar to capture the carbon until we figure out how to stop making so much of it.