Forget about 2012, it's 2020.

Marc Faber recently put it as 2018 (he gave "capitalism" 5-10 years time before it all turns to anarchy - http://www.businessinsider.com/henry-blodget-marc-faber-the-future-will-be-a-total-disaster-with-a-collapse-of-our-capitalistic-system-as-we-know-it-2009-9), which is not far off from the Club of Rome's 2020 "overshoot and collapse"("Limits to Growth").

Focus on the first 10-15 minutes of the video (skips the Australian case).

http://www.themonthly.com.au/limits-growth-2009-graham-turner-1580

Silver lining: behavioral change of human beings can be like a flip of the switch. Think the "Twitter-Iran-Election" phenomenon :) (let's all consume as little as possible and use sustainable energy etc. and start having as few children as possible by spreading birth control technologies to the poorest countries in the world as they often have the fastest population growth rates).

One way or the other, it's the moral imperative for us to protect the planet and live in sustainable manners (as opposed to the unsustainable exponential growth).

Forget about 2012, it's 2020.