I was under the impression of having read something very recently in New Scientist, suggesting we're on a possible crux - the possibility of a reversal occuring over the next 1000 years. That's not a great span in terms of human history.
What exactly would be the effects of a magnetic field reversal on humanity? I doubt that the effects would be clastrophobic because it has happened many times before; and mass extinctions don't seem to really have a link with magnetic field reversals. Of course, compasses will start to fail to work effectively, but we're finding better ways to find the direction of North; and the change is also gradual, so animals which rely on magnetism to navigate will have time to adapt..
How would the magnetosphere of the Earth change, for instance? Would we see the Auora Borealis at the Equator with a change, but not necessarily a reversal, in the magnetic fields? :P
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