Well most of their models are based on what was happening in 1998-2006 anyways. If you look at those models, flawed that they were even at the time, it looks like we were doomed by 2012, but it never happened.
Flawed models
outdated models
based on technology that is being phased out or improved
=
doom and gloom!
That is the key problem with all of these predictions is that they assume nothing will change, nothing will get more efficient and nothing will get more cleaner just through technological advances that go on daily.
Its really a scare tactic/hoax at this point.
I love science, but this has never been about the science. It is about the absolute power over you, me, and the world that they seek.