"one looks even further back and sees a period that is as warm as today"
and even warmer!! but that would be a planet almost uninhabitable by humans, and if that's the future level of warm, then industrial civilization would be almost certainly harmed seriously if not downgraded to pre-industrial levels of resource consumption.
eg, the US sunbelt exploded in population with the advent of a/c in homes, offices, cars, detaching people from the sweaty, stinky, humid natural reality of the region.

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