Look, if we're talking about non-profecised end-of-the-world just wait until the magnetic pole shifts {the south pole is already creeping north, and you can find this out pretty easily}. Once the earth's magnetic field begins to decay in order to reverse itself, the massive surge in UV radiation should wipe out most life... unless it can adapt pretty damn quickly. And you can expect the field to regain full strength in... oh, around 1000 years.
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