This is what's going on and what's going to happen.
Earth's rotation axis is shifting. As we get closer to 2012, our two "extreme" seasons will be getting worse and worse. Meaning summer is getting hotter while winter is getting colder. While all of this is happening, earth's magnetic field and all that other jazz is weakening. Which is the cause for the "extreme" seasons becoming worse and worse. During 2012 the two seasons will be at their peak and earth will begin to settle into it's new rotation axis.
All of this was explained on the science channel and there is absolutely nothing to worry about unless you can't take the heat/cold. In which case go and buy yourself and air conditioner/heater. Maybe armor your house in preparation for all the crazies.
The only way we'll go extinct on 2012 is if we all kill each other.
I fully state right away that my knowledge on Earth's rotation is a little low, but the big Indian Ocean in 2004 messed up the rotation by 3 microseconds. Which is really small.
In order to have any kind of extremes in temperatures, in any actual noticeable effects, the Earth's rotation would have to be adjusted by more than 10 minutes.
The amount of force required to adjust the rotation of the Earth that much, would be around 700 million times that of the Indian Ocean earthquake.
Or basically a magnitude 20 Earthquake.
Which can't exist. Or basically, enough energy to turn the Earth into a nice asteroid belt.
It's less than the energy output of a supernova...but still.
Also, the magnetic field of the Earth weakens and strengths at a set period of time, and while we're overdue for magnetic pole shift, they're not the end of the world, even if our compasses will suddenly point south...
Also, no need to worry about 2012. Worry about 2020, when I become president!
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