I would agree with Rodri on this one. While it may be theoretically possible it would not be the pretty happy world you see in sci-fi movies. Resorting to canniblism a'la soylent green is another possible reality. If you had ever seen that old movie then you would know that humans were added to the food supply without people knowing where it came from. If the world were largely filled by a mega-metropolis though there would be far too few crops or herds to feed a global population so it just may come to that. Hydroponics though could replace conventional crops, and food diets can be supplimented with algae which turns waste and pollution into edible protien, and it can be used as a biofuel.
Killing people never solves anything but it keeps them out of your hair while you think of an alternative.
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