10% or 1%

Gernot Wagner's book Climate Shock is due out this spring.
His argument:

If you had a 10 percent chance of having a fatal car accident, you’d take necessary precautions. If your finances had a 10 percent chance of suffering a severe loss, you’d reevaluate your assets. So if we know the world is warming and there’s a 10 percent chance this might eventually lead to a catastrophe beyond anything we could imagine, why aren’t we doing more about climate change right now? We insure our lives against an uncertain future—why not our planet?

 Well, yes.  Or we could apply Dick Cheney's 1% rule.