half a degree of (eventual) warming relative to present isn't the end of the world. calling it that isn't reasonable or okayhttps://twitter.com/AOC/status/1087722312168812551 …
i agree that existential risk isn't the same thing as earth becoming uninhabitable to human life, but i disagree that earth can't become uninhabitable to human life and i think the difference is much smaller than you think it is
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seems like a sufficiently large asteroid would do it, not sure about supervolcano, future bio/AI/nano could all do it, currently unknown future techs could do it, waiting for a billion years or so would do it
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as considerations in the other direction, humans can become capable of inhabiting places that aren't inhabitable with current technology, and i suspect 30 deg is a major understatement of the (admittedly extreme) total uninhabitability criterion
End of conversation
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