The 2012 "prophecy" was someone's flaky interpretation of a Mayan calendar which merely tells of a great "roll-over," like on your car's odometer. It was the end of an era, and the beginning of another, just like going from 99,999 to 100,000 miles.
The Mayans seemed to add little or no additional significance to it.
The New World Order folks would like to sell us on a new Carbon Tax for making trillions of extra dollars, and for insinuating themselves even further into our lives, but climate is always under a state of flux. In the last 12,000 years, we've had many mini-ice ages and warm periods, including the Younger Dryas (~13,000 - 11,600 BC).