The Paris Climate Accord is a cultural marxist scam designed to skim off many billions of dollars from rich nations to line the purses of despots and the "climate challenged" nations. The USA has thankfully, not signed on to this piece of crap. Not what the UK Guardian thinks:
Paris climate change agreement enters into force
The Paris agreement on climate change enters into force on Friday, marking the first time that governments have agreed legally binding limits to global temperature rises.
The passage of the accord – the fruit of more than two decades of often tortuous international negotiations on combating climate change – was hailed by nations and observers around the world.
Under the agreement, all governments that have ratified the accord, which includes the US, China, India and the EU, now carry an obligation to hold global warming to no more than 2C above pre-industrial levels. That is what scientists regard as the limit of safety, beyond which climate change is likely to become catastrophic and irreversible.
Unnnh - that would be a no. From the United Nations Framework Convention on Climate Change:
Paris Agreement - Status of Ratification
The Paris Agreement 
entered into force on 4 November 2016, thirty days after the date on which at least 55 Parties to the Convention accounting in total for at least an estimated 55 % of the total global greenhouse gas emissions have deposited their instruments of ratification, acceptance, approval or accession with the Depository.
The list below contains the latest information concerning dates of signature and receipt of instruments of ratification by the Secretary-General of the United Nations, as Depository of the Kyoto Protocol. The dates in the third column are those of the receipt of the instrument of ratification, acceptance (A) or approval (AA).
Authoritative information on the status of the Paris Agreement, including information on signatories to the Agreement, ratification and entry into force, is provided by the Depository, through the United Nations Treaty Collection website, which can be accessed here, and the Depository Notifications which are available here.
Background information related to the ratification, acceptance, approval or accession of the Paris Agreement, as well as its entry into force can be found here.
As you can see from the list, the United States accepted the ratification but it did not issue a declaration. Obama is forcing this using his pen and his phone but the Senate is not ratifying this treaty (as they must under the US Constitution and it must be by a 2/3rds vote).
