the 2012 date referrs to 3 days of darkness thats in the myan book of the dead.

saposadly the earth's rotation will start to decay, and for 3 days stop, then start rotating the oposit way. durring this time earth's gravity will be 3 times what it is now, and the sky will turn black from atmospheric disturbences. this is caused by the earths magnetic polls switching, and i guess you can see evidence of massive changes. like weather, and techtonic plate dissplacement. if one of these plates slipps underwater, the resulting tsunami will be a wall of water 100ft tall and miles long.