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Put gently, its a load of codswallop!
A reversal of the earth's magnetic field is overdue and could be under way. During the period when the field is at its lowest our protection from particulate radiation from the sun may be compromised and radiation levels considerably increased with the corresponding increase in the deleterious effects of ionising radiation. This has never affected life very significantly in the past so I see no reason for it to be a real problem in the future.Say for example if cancer rates increased by a factor of ten for a while we could live with it. It is not nice for the unlucky ones and would put further stress on health resources but would not kill off a significant percentage of the population before they yhad a chance to ensure a new generation.There seems to be a total obsession around that this world must be a stable place and death optional. This is not and never will be true we need to be collectively able to survive many sorts of changes and have spare capacity to do this. Running with the absolute maximum population at maximum utilisation of resources is and always was a stupid idea. The world needs to get its act together and work things out properly. Maybe it will only be a really big disaster (several orders of magnitude bigger that anything on record over a large proportion of the earth) that will bang a few heads together and get most of the world leaders thinking on sensible lines and stop bickering about total inconsequential things like minor differences in religions and precisely who has rights to exploit small patches of land.
So, the Mayans are like the computer programmers who chose to represent years with 2 digits... which caused many predictions of the end of the world a decade ago.Does the Gregorian Calendar end on December 31, 9999?