if humans dug down instead of building skyscrapers, then we could have more surface area to produce oxygen/food. also, there are vast amounts of land that is yet uninhabited.
not to be too unrealistic, but according to the rate at which technology has developed, there is a good chance that off-world colonies will exist in the near-future.
i dont get this whole overpopulation mess. except about how humans are negatively impacting the livelihood of other species, that is a serious issue imo.
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