How Many Billions of People Would Die Under Net Zero?

Around 1800, humanity crossed the 1 billion souls mark. The Industrial Revolution was in the early years of the first iteration. Still, this was before the massive productivity gains that petrochemicals and the information age brought upon us. That might be a level we need to shrink towards. Maybe some more people could be sustained today as some tech would not simply go away but even if we double the number we would have to cull 3 fourths of the world’s population. However, as cruel as this sounds this is not even the hardest issue to grapple with. Because the 2 billion or so survivors won’t be able to enjoy their lives much anymore. At least a large majority of those people would have to revert to subsistence. How well is that going to go down? 

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