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 Depositary.
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 Depositary, through the United Nations Treaty Collection website, which can be accessed here, and the Depositary Notifications which are available here.
The first part of session of the Conference of the Parties serving as the Meeting of the Parties to the Paris Agreement (CMA 1.1) took place in Marrakech, Morocco from 15-18 November 2016. The second part of the first session (CMA 1.2) took place under the Presidency of Fiji, in Bonn, Germany, from 6-18 November 2017. The third part of the first session (CMA 1.3) will be held in conjunction with the 24th session of the Conference of the Parties (COP 24) in Katowice, Poland, in December 2018.
Further information related to the Paris Agreement can be found here.