What do you do about the expansion of populations (http://www.nzdl.org/gsdl/collect/fnl2.2/archives/HASH8cd2.di...) in developing countries that are still waiting for rapid growth? Intuitively, as they transition to developed economies that will come with greater CO2 emissions. Do you force them to adapt less economically viable sources of energy consumption? Natural gas may be the best bet there. I am not holding my breath for solar power and wind turbines to be adopted by countries that still face widespread malnutrition.
I don't think democracy and liberal capitalism will have any consequential solution to global warming, people are too inherently motivated by short-term and local gain. Unfortunately, any massive change will probably have to be dictatorial/authoritarian/militant, what are the byproducts of that?