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Anything that threatens all of humanity. Best example is nukes but the genie is out of the bottle there.
Something that has been hypothesized is bring very large asteroids into earths orbit so we can more easily mine it, this could be super dangerous, if we get one calculation wrong, we get dinosaurs 2.0
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It's really a good option. I accidently had random selected and saw a really good post that I thought was new. I zapped it and then realized it was old.