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.
Further information related to the Paris Agreement can be found here.
By decision 1/CP.21, paragraph 22, the Conference of the Parties (COP) invited Parties to communicate their first nationally determined contribution (NDC) no later than when the Party submits its respective instrument of ratification, acceptance, approval or accession. If a Party has communicated an intended nationally determined contribution (INDC) prior to joining the Agreement, that Party shall be considered to have satisfied this provision unless that Party decides otherwise. Further information can be found here.