John Kerry signed the Paris Agreement for the USA with his granddaughter in April 2016. It was ratified on 3 Sep 2016.
The USA’s pledges
“Several U.S. laws, as well as existing and proposed regulations thereunder, are relevant to the implementation of the U.S. target, including the Clean Air Act (42 U.S.C. §7401 et seq.), the Energy Policy Act (42 U.S.C. §13201 et seq.), and the Energy Independence and Security Act (42 U.S.C. § 17001 et seq.)”