Is it worth it to prepare for the end of the world?

Are the people believe in the prophecies of 2012? One of them is the end of the world, which is to take place December 21. Does anyone ever take this into account? Probably not, but it's okay to live as he had to take place - "that is life to the fullest." There are some, however, that faith does not allow for even reading horoscopes. - Catholics do not believe in any prophecies, you leave it to God and everything will work out - say.
And if as I wrote before, the end of the world is our merit?We are destroying our planet..and what if Mayan predicted it? Maybe they new that in 2012 the alien will come back to safe us, cause our Earth can take it any more?
How we can prepare? Just to be good to each other, take care of our environment every day...instead throw paper on the street, better bin it.
Because They are watching...and not every one will be saved.