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I dont know any of the science behind the amount of people we can sustain, but I cant imagine we are that close to running out of stuff. Worse to worst we can always take large percentiles of the population and put them on uninhabited islands, with a naval blockade around said islands. We check in on them in ten years and the survivors get to come back to the mainland, while a new wave goes into the island. Of course we would through in wild cards, such as death row inmates and dinosaurs on the island.
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It's not so much a matter of killing existing people as it is about heavily restricting reproduction around the world. With so many people on our small planet I can't justify anyone having more than one kid. Yet there are people who have no problem with having 8 or more. We need to get to a point where the global death rate is higher than the birth rate for quite a while until the numbers have gone down a bit, or at least stabilized.