The world may not "end" in 2012 but I do believe its going to be a major tipping point for life as everyone knows it. If you think about it, the problems we're facing are irrefutably mounting up:
deforestation, global warming, extreme weather, food and water shortage, overpopulation, increasing interpersonal tension (middle-east, not drama forum), sea levels rising, animal extinction, ozone layer deterioration, economic breakdown, ocean pollution (and fish dying as a result)
If you think any of those is going to just "go away" in the near future you should probably think again. Those problems are mounting up and they're going to kick us in the ass at some point.