What is the probability that the world will unite to lower CO2 emissions enough to make any difference?

Please no speeches about whether GW is real. I'm only asking about getting the world united about anything. 100% would be total confidence in world unity. Given that we can not get unanimous support to boycott Iran to prevent nuclear catastrophe. China and India both have said they will not slow down development. To my knowledge not one signer of Kyoto met their target. How do you convince third world people living in poverty to remain poor. My guess is that the likelihood of success is <1%.