The rich have, and the poor have not.

These international climate negotiations will never succeed because fossil fuels are cheaper than green energy. (Cheaper to the user, though not necessarily cheaper to the world.)
In my opinion the world will not switch to green energy until it is cheaper than fossil fuels. The best way the developed world can make green fuels cheaper is through massive support of Research, Development, and Demonstration of clean energy. Every week Physorg details a few more steps that reduce the cost of Biofuels, Solar, Wind, Geothermal, etc. There should be a vast international effort to greatly accelerate scientific progress in green energy to make it cheaper than fossil fuels. Once green energy is cheaper, the world will voluntarily, eagerly switch away from burning fossil fuels.