re: How much longer do think humanity/earth survives

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That isn't really how evolution works. We've developed an infrastructure where the pretty much anyone from the species can reproduce and people with shitty genes don't have nearly as difficult of a time surviving as other species.

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You are confusing evolution with natural selection. Evolution cannot be stopped, even in human's current condition that you described. It simply won't necessarily lead to an advantageous result, but it is still occurring.