The language of the agreement was negotiated by representatives of 197 parties at the 21st UNFCCC Conference of the Parties in Paris and agreed on 12 December 2015.   The agreement was signed at UN Headquarters in New York from 22 April 2016 to 21 April 2017 by states and regional economic integration organisations parties to the UNFCCC (convention).  The agreement stated that it would only enter into force if 55 countries that produce at least 55% of global greenhouse gas emissions (according to a list drawn up in 2015) ratify, accept, approve or adhere to the agreement.  On April 1, 2016, the United States and China, which together account for nearly 40% of global emissions, issued a joint statement confirming that the two countries would sign the Paris Climate Agreement.  175 contracting parties (174 states and the European Union) signed the agreement on the first day of its signing.   On the same day, more than 20 countries announced plans to join the accession as soon as possible in 2016. The ratification by the European Union has achieved a sufficient number of contracting parties to enter into force on 4 November 2016. (1) The UNFCCC dates back to the 1992 “Earth Summit” in Rio de Janeiro. The Convention established a framework for action to stabilize atmospheric concentrations of greenhouse gases (GHGs) to avoid “dangerous anthropogenic disturbances of the climate system.” The UNFCCC, which came into force on 21 March 1994, now has a nearly universal number of 195 parties. The Annual Conference of the Parties (COP) examines the implementation of the convention. COP3 adopted the Kyoto Protocol, which was not monitored at COP15 in Copenhagen.
At COP17 in Durban, the Green Climate Fund was established, the basis of the Paris conference, at which, for the first time in more than 20 years, participants aspired to a universal and binding climate agreement to keep global warming below 2 degrees Celsius. On November 4, 2019, the United States informed the custodian of its withdrawal from the agreement, which will take effect exactly one year after that date.  The EU and its member states are individually responsible for ratifying the Paris Agreement. There was a strong preference for the EU and its 28 Member States to simultaneously table their ratification instruments to ensure that neither the EU nor its Member States commit to obligations that belong exclusively to the other and there was concern that there was a disagreement over each Member State`s share of the EU-wide reduction target. just as Britain`s vote to leave the EU could delay the Paris pact.  However, on 4 October 2016, the European Parliament approved the ratification of the Paris Agreement and the EU tabled its ratification instruments on 5 October 2016 with several EU Member States.  The Paris Agreement is an agreement within the framework of the United Nations Framework Convention on Climate Change (UNFCCC) that deals with the reduction, adaptation and financing of greenhouse gas emissions from 2020. The agreement aims to address the threat of global climate change by keeping global temperatures well below 2 degrees Celsius above pre-industrial levels this century and to continue efforts to further limit the temperature increase to 1.5 degrees Celsius.  On 22 April, Ambassador Mahmoud Saikal, permanent representative of the I.R. Afghanistan, participated in the signing ceremony of the Paris Agreement on climate change and signed the agreement on behalf of Afghanistan.
174 countries and the European Union also signed the agreement, which surpassed the historic record of signing an international agreement on the first day.