We live in a different world than 1800-2000 when migration, births, and fossil fuels were the powertrain of growth. The math has changed. Edit: I don't know wh

We live in a different world than 1800-2000 when migration, births, and fossil fuels were the powertrain of growth. The math has changed. Edit: I don't know what the answer is, other than to say 'it's probably not what it was before'.