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Originally Posted by isaidso
I'm assuming he means 1 billion with today's technology and social advancement.
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They're a bit tied together. If world's population collapse, picture how our cities would like, with the idle infrastructure everywhere, vacant houses, etc. And forget economies of scale. With much less people, some goods and services would be discontinued altogether due the lack of demand and we'll be poorer overall, with much of our needs left unmet.
From the environmental point of view, 1 billion people Earth would be better. But from mankind, definitely not.
In any case, world's population won't grow for much longer.