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Realistically, how will humanity end?

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DunningKruger · 61-69, M
Depends on what you mean by humanity.

Likely, humanity will eventually split into different species — that is, coming from the same root but be incapable of interbreeding. Although both species will coexist for a long time, eventually, the species best suited for the environment will out compete the other(s). Will this surviving species that is descended from us still be "human?" Hard to say.