:O all wrong, don't want to go into detail here is a short explantion.
1) Why should be believe the mayans? The Chinese were much better than them and never thought of it
2) Solar storms don't kill anyone
3) CERN is the atom smasher in question, and if it does work we will die in a month not 2012
4) Oh noes, lets start believing the bible!!
5) The super volcano at best can only take about 1/8 of the world
6) When mathematicians say major event they mean some sort of tsunami, we are exaggerating every death now
7) Oh hi, you know point 2? The magnetic field is saving us but we died anyway, so what's the use of it? (also it won't swap in 2012, and it only gets weaker and not disappear)