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jdnenej
on Jan 16, 2020
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Climate threats now dominate long-term risks, surv...
It's a copypasta. OP didn't make up the number 2 but I'm guessing it comes down to 2 being a tolerable number to most people.
yoube
on Jan 16, 2020
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I mean, it's literally the replacement population. 2 parents die, 2 children remain.
adrianN
on Jan 16, 2020
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Technically you need a little more than 2 because people die without having children occasionally.
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