Will there really be a ‘polar shift’ or change in the Earth’s magnetic field in 2012? What’s this all about?

The following is a question being asked on Yahoo Answers. Both the questions and answers given do not reflect the view of our website.
Question:
There are, of course, zillions of prophecies and silly ideas about the year 2012.

But is there any scientific basis to the idea of a ‘polar shift’ or something to do with the Earth’s magnetic field?

Thanks!

Do you believe the world will end on December 21, 2012? I believe this is a Mayan and a Nostradamus prediction?

The following is a question being asked on Yahoo Answers. Both the questions and answers given do not reflect the view of our website.
Question:
Do you believe the world will end on December 21, 2012? I believe this is a Mayan and a Nostradamus prediction
Global warming might be the cause.

What do scientists say about this “Doomsday 2012″ on the Mayan calendar?

The following is a question being asked on Yahoo Answers. Both the questions and answers given do not reflect the view of our website.
Question:
I have a project in which we have to write an article about something, and i chose this as my topic and then i need to have a proof for this. So can you guys please help me?