Life After December 21 2012 
Ian spoke with Marie D. Jones about what we can expect in 2012 and what  it may be like in the year 2013. Jones went through some of the common  worst case scenarios (asteroid impact, pole shift, supervolcano  eruption) for December 21, 2012, and Ian invited callers to phone in  with their theories about what will happen on that date. Jones said she  does not think any naturally-occuring, world-ending event will take  place in 2012. For Jones, the worst case scenario will be human driven,  possibly a nuclear war. Jones and Ian also talked about the discrepancy  between the Mayan calendar and the Gregorian calendar.
Jones  envisioned what life may be like in the year 2013. She expressed concern  about the continued acceleration of technology and how it could  interfere with our ability to connect with each other. She also  discussed the threat of global climate change and the role of  traditional western religions in the future. 
Wikipedia
The  2012 phenomenon comprises a range of eschatological beliefs according to  which cataclysmic or transformative events will occur on 21 December  2012. This date is regarded as the end-date of a 5,125-year-long cycle  in the Mesoamerican Long Count calendar. Various astronomical alignments  and numerological formulae have been proposed as pertaining to this  date, though none have been accepted by mainstream scholarship.
A  New Age interpretation of this transition is that this date marks the  start of time in which Earth and its inhabitants may undergo a positive  physical or spiritual transformation, and that 2012 may mark the  beginning of a new era. Others suggest that the 2012 date marks the end  of the world or a similar catastrophe. Scenarios suggested for the end  of the world include the arrival of the next solar maximum, an  interaction between Earth and the black hole at the center of the  galaxy, or Earth's collision with a planet called "Nibiru".
Scholars  from various disciplines have dismissed the idea of such cataclysmic  events occurring in 2012. Professional Mayanist scholars state that  predictions of impending doom are not found in any of the extant classic  Maya accounts, and that the idea that the Long Count calendar "ends" in  2012 misrepresents Maya history and culture
Astronomers and other  scientists have rejected the proposals as pseudoscience, stating that  they conflict with simple astronomical observations and amount to "a  distraction from more important science concerns, such as global warming  and loss of biological diversity"
 Geomagnetic reversal
Another  idea tied to 2012 involves a geomagnetic reversal (often incorrectly  referred to as a pole shift by proponents), possibly triggered by a  massive solar flare, that would release an energy equal to 100 billion  atomic bombs. This belief is supposedly supported by observations that  the Earth's magnetic field is weakening, which could precede a reversal  of the north and south magnetic poles.
Author Graham Hancock, in  his book Fingerprints of the Gods, interpreted Coe's remarks in Breaking  the Maya Code as evidence for the prophecy of a global cataclysm.  Filmmaker Roland Emmerich would later credit the book with inspiring his  2009 disaster film 2012.
Other speculations regarding doomsday  in 2012 have included predictions by the Web Bot project, a computer  program that purports to predict the future using Internet chatter.  However, commentators have rejected the programmers' claims to have  successfully predicted natural disasters, which web chatter could never  predict, as opposed to human-caused disasters like stock market crashes.
Also,  the 2012 date has been loosely tied to the long-running concept of the  Photon Belt, which predicts a form of interaction between Earth and  Alcyone, the largest star of the Pleiades cluster. Critics have argued  that photons cannot form belts, that the Pleiades, located more than 400  light years away, could have no effect on Earth, and that the Solar  System, rather than getting closer to the Pleiades, is in fact moving  farther away from them.
The 2012 phenomenon has been discussed or  referenced in several media. Several TV documentaries, as well as many  contemporary fictional references to the year 2012 refer to 21 December  as the day of a cataclysmic event.
The History Channel has aired a  handful of special series on doomsday that include analysis of 2012  theories, such as Decoding the Past (2005--2007), 2012, End of Days  (2006), Last Days on Earth (2006), Seven Signs of the Apocalypse (2007),  and Nostradamus 2012 (2008).[136] The Discovery Channel also aired 2012  Apocalypse in 2009, suggesting that massive solar storms, magnetic pole  reversal, earthquakes, supervolcanoes, and other drastic natural events  may occur in 2012. In 2012, the National Geographic Channel launched a  show called Doomsday Preppers, a documentary series about survivalists  preparing for various cataclysms, including the 2012 doomsday.