We've been hearing about tipping points and irreversible consequences for 30 years now. So wake me up when it happens or you bring up scientifically backed solutions. Until then, I'll just watch 2012 every christmas.
But no-one argues the fact that the average global temp has increased dramatically, compared to the previous thousands of years, in the last 100 years. That's lightening fast on a geologic scale, but still pretty slow on a human scale.
My point is: don't throw the baby out with the bathwater. Just because some people overstated the case doesn't mean it's all bunk.