Speaking about the origin of the world is complicated, given that there are several theories about it. At this point science and religion have never been able to reach an agreement.
End of the world is other of the topic or point in which science and religion will never reach an agreement. In this discussion there are many more actors that in the origin of the world. Here are the religious beliefs, superstitions, prophecy and belief systems of different cultures.
The Maya culture is one case; they mention an intern transformation in the human species like consequence of the transformation of the galaxy. The year 2012 isn’t the end of the world, physical and materially speaking, but that is the end of an era and the beginning of another, the age of knowledge.
In my opinion, the end of the world will be a responsibility of human species, product of the wars and nuclear arms that hasn’t fixed beforehand. The other possibility is that a large meteorite hit the planet, so strong that it destroyed forever.
I imagine the end of the world like an erupting volcano, with high temperature, lots of wind and the planet earth breaking little by little. Some people running desperate and other quiet contemplating what happens. I will run desperate at first to feel the adrenaline and later I will look quietly all as happens.
If the world ended, what would I do this year? I think that for my case, you all know the answer to this question. I will dance salsa all the time and I would do a course of diving.