I have not studied this in great detail so take my point as speculation. My memory is that the US withdrew from Kyoto as well. They withdrew but were still one

I have not studied this in great detail so take my point as speculation. My memory is that the US withdrew from Kyoto as well. They withdrew but were still one of the few countries that actually reached the goal outlined there. The reason was not political action but rather market adoption. I don't know much beyond that but it is possible that much the same could happen, if coal is continualy replaced with gas or solar. Cars will be replaced with EV soon enough, even outside of any government action or gloabl agreement. Again if have not studied the magnitude of all these changes and compared them to what exactly the parameters of Paris are so I am not arguing that trump did the right thing. In fact, if you expact the outcome anyway signing might be "free". I just think some people mistake the signing of a international agreement with results. Kyoto did show that that was not really always the case. Not signing some agreement will not automatically mean we are heading for Mad Max. The actual outcome and compliance will be mostly detrmained by internal politics of each country.