If this event takes place we are talking a good few years of very extreme weather, 2012 is just the 'peek' year.
When you say "Only mass human extinction or partial wipeout will save earth anyway." What exactly do you mean mate?
Humans are the biggest threat to the planet.
Look around mate, there are too many of us and we are sucking the place dry.
We have already worked out how to destroy all life and are close to creating it also. Time we left if we can't sort it out.