Let us first call a “spade a spade”. The Paris Climate Agreement is not a legally binding treaty proposed by the Obama Administration and ratified by the Senate. This agreement is a mere “sole executive agreement”
which is the lowest form of commitment the United States can make and still be party to an agreement.
Thus President Trump can withdraw from this non-enforceable agreement fairly easily and quickly. Trump should withdraw the U.S. entirely from this agreement, and I suggest he will.