this event is possibly going to happen:
http://en.wikipedia.org/wiki/Geomagnetic_reversal
but there's good news:
Quote:
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Because the magnetic field has never been observed to reverse by humans with instrumentation, and the mechanism of field generation is not well understood, it is difficult to say what the characteristics of the magnetic field might be leading up to such a reversal. Some speculate that a greatly diminished magnetic field during a reversal period will expose the surface of the earth to a substantial and potentially damaging increase in cosmic radiation. However, Homo erectus and their ancestors certainly survived many previous reversals.
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The worst that will happen upon the event that the North and South magnetic poles reverse is that compasses and navigational systems will need to be adjusted. Yes, there may be some issues cause by this... but the end of the world? NO.