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Now that we've got "global pandemic" marked off our bingo card, I'd put this at the top of the most likely "unforeseen" worldwide disasters. Some kind of supervolcano eruption is the other candidate.

Of course, not all disasters are global and every country or region will have its own rare disasters to prepare for.

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Add asteroid strike at with the energy level of a nuclear warhead to that list. Fortunately, it is 71% likely to come down in the ocean.

It would have to be a lot bigger than "a nuclear warhead" to cause a global catastrophe rather than a local one, and it has to be more unfortunately aimed than just coming down over land. It would be pretty bad if the Chelyabinsk meteor had hit Tokyo or Mexico City, but as it happened it troubled glaziers more than doctors.

The problem with a sudden nuclear scale explosion is that it could trigger a nuclear exchange.

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