Excuse me for flaming but for first time I will do it.
That's BULLSHIT. If a planet was that big, to cover the sun, then we would now have evidence, and not just thoughts.
1/4 of the people say that Nibiru will destroy us.
The other 1/4 say that the ice will melt and the earth will be covered again by the sea.
The other 1/4 say that the sun will start getting destroyed and some of his "pieces" will fell on the earth.
Why should the change on 2012 be bad?
I mean, all that time, people are doing the worst things that can happen.
So, the only change that could happen is good. How about thinking that the change will be good? That people will start have feelings about other people, and care for the environment? Well, that's a theory too of course.
But know something: The destruction we're causing to the world daily, is the worst that can happen.
We have allready started destroying the world, we don't need to wait a planet to do it.
That's a wise thought.
Start thinking logically.
Best Regards,
~Coyote.