The trick is to start 30 years ago, when everybody knew that climate change was real and serious. Then the US can join with other countries to implement any of a variety of carbon control measures, such as a carbon tax. With a worldwide consensus, it would be much more difficult for China to grow its carbon production so rapidly (and for Western countries to outsource all of their carbon-producing activities to China).

Of course, that involves not having spent three decades inculcating paranoid conspiracy theories in the American public. Instead, we can move on to stage 5 climate denialism, "Well, it's too late to do anything about it now".