I think the exact opposite is true. In order to make real climate change progress we'll have to have a all the major nations on board for real cuts to C02 usage

I think the exact opposite is true. In order to make real climate change progress we'll have to have a all the major nations on board for real cuts to C02 usage. That includes telling China, India, and Brazil that they must use a fraction of the C0/2 per capita that western nations use. On the other hand, a single rouge nation could engage in geoengineering. Some even claim a rouge billionaire could do it.