Is a population of 10 billion or even above actually sustainable on Earth?
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I have seen simple analyses that claim even 100 billion people can be sustained on earth. It all depends on the level of technology and integration you are willing to consider. Food is the easiest part as with the use of more active farming techniques (greenhouses, hydroponics) you can increase production by a factor of two or more and you can even stack the farms vertically in buildings for 100x more food per area of land.
Sustainable materials is a much harder question but with advancing technology it is likely possible to restrict ourselves to that which can be produced without destroying the planet.
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