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How many humans have ever been born and if we assume that no member of the species had ever died would Earth be able to sustain us?

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According to one estimate, some 70 billion(70,000,000,000)people have inhabited the Earth since man first appeared,(which begs another question I can't answer),and, no, it's not possible for Earth to sustain that many people at once.Given the dwindling resources and problems of health and crowding,a more realistic upper estimate would be 9-10 billion,which we may see this century.

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