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I'd go with the traditional option: bioweapon (natural or man-made). It would have following properties: no symptoms until activation (so low probability of detection and no panic) highly virulent even before activation (so you have most of the world population affected) activates by a singular world-wide event (e.g. massive solar flare) turns most of ...


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I can think of a couple options: Gray Goo An unstoppable swarm of nanites, or maybe even larger (e.g. insect-sized) creatures that destroy all non-bio-associated metal, would probably do the trick. Ancient stone buildings (and wood buildings with all wood joining) will mostly be unaffected, but many modern buildings will collapse, and the economic ...


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A nearby supernova might well meet your requirements. Such an event occurring within 50-100 light years of Earth might well have adverse effects on Earth. If the distance of the supernova were just 30 light years the effects would likely be devastating. In fact the close the event the worse the effect, so you can dial up whatever level of destruction you ...


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In my mind the hardest criteria to meet in what you posted is wrecking all the buildings. It's actually a lot easier to kill off most or all of the human population and leave them standing. The thing about the human population is that it's maintained through a really terrifyingly fragile infrastructure, and the more developed and urbanized the population ...


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Some kind of super-hurricane would do the job. The wind plus flooding would wipe out most people, animals, plants and buildings. (Not sea life though, if that matters.) Only those at high elevations would survive, and maybe some by pure luck. You could create such a hurricane by heating ocean water which feeds hurricanes. You would probably want to have a "...


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It would not, in general, be realistic, because there are plenty of horses in New Orleans and the surrounding areas today. Importing them would only make sense in two cases: 1) Something in the apocalypse caused the local horses to die out or become sterile. Perhaps due to a disease like malaria, whose vector (a mosquito) can't survive cold northern ...


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If people do need something, they move heaven and earth for it. So people, somehow, using horses for transportation is fine. However the real question is does it make sense? A post apocalyptic setting would mean a couple of things. For starter cities are a lot smaller with a situation similar to medieval, particularly medieval, cities. As people can't ...


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