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Very few people understand the difference between a 'global catastrophic risk' that might kill 98% of humanity but might allow survivors to bounce back and survive for millions more years, v. a true 'existential risk' that kills 100% of humanity, forever, within a few decades.
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Your categories actually don't account for known extinction drivers - geological and cosmic disasters. A full on eruption of Yellowstone, for example, could easily snuff us out. So could a sufficiently large meteor strike.
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