Well, hard to know if we'll be dead, but the world will be a very different place after 23rd December 2012
That and what these idiots who make up these stories aren't tell you, is that carbon emmissions produced by humans makes up 0.2% of all of the carbon emmissions... yes shit is happening, but we aren't to blame. I find it amusing that people assume that the earth has reached a certain point, and any "change" is our fault. Sure we're using up the natural resources etc, but whether we are here or not, the earth was going to change anyway