Trump now understand I think that climate change is real threat to the existence of USA and he should stay on paris agreement. If it isn't the case, companies like Exxon Mobile would not protect the agreement. But he remember what he say before the election so it is difficult to him. But now even from his voters 47% want to stay and only 28% to leave. It mean very possibly, that even in the election most of voters was for the agreement and vote for Trump because of others reasons-he should not act against the majority of his voters. http://climatecommunication.yale.edu/publications/5-1-voters-say-u-s-participate-paris-climate-agreement/ I think, it even possible that some voters change their opinion since the election. If someone want to buy house and then discovered that it go to fall, but will be forsed to move to it even if he do not want it more, I do not think he will be happy. And if he do not beleive the poll he can simply, MAKE A REFERENDUM.