half a degree is also way lower than consensus for the next century, so I'm not sure how any of this is relevant
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
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