According to the Mayan calendar, the current Golden Age (the fifth), will end on 21 December 2012.
The previous four eras (Water, Air, Fire and Earth) would all end with huge environmental upheavals.
According to various researchers, the cataclysms that marked the end of the Mayan Ages were caused by a reversal of the Earth's magnetic field, due to a shift of the planet.
Do you want to know how much time is left on this fateful date? Download Maya Calendar!