Putting politics aside, which I realize is a difficult task for SOME people, what do we have to lose by paying attention to global warming?

I saw the film, and I had questions.   First of all, there have been a number of "ice ages" in the history of this planet, and there will be more before the lights are shut off.   

Most scientists seem to agree that humans are contributing to global warming, but there is difference as to what extent.

The question is - what do we have to lose by trying to correct the balance?   By controlling emissions the worse that can happen is nothing. The air will be easier to breathe, cars will be cheaper to operatre, and live goes on.   Failure to act can result in deeper problems.

If you have a festering boil on your neck, you can say it is nothing and leave it alone and hope it doesn't spread or turn into something else. Or you can stop whining and worrying and do something about it.