Since Trump`s announcement, the U.S. federal government has continued to send delegates to UN climate summits and will continue to do so at the next summit in Poland in December. They are competing with a rival delegation of U.S. governors, mayors and business leaders, all of whom have promised that U.S. states would compensate for the lack of federal government action. The United States can leave the agreement, but California cannot. Questioned by CEO Bolsonaro at a closed-door meeting at the World Economic Forum in Davos, Switzerland, on 22 January 2019, he said Brazil would remain in the agreement, but his statement is quoted as qualified that the country will participate “for now” in the agreement. A few minutes earlier, Mr. Bolsonaro had not taken a public position on this in his prepared plenary speech.
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. On June 1, 2017, U.S. President Donald Trump announced that the United States would withdraw from the agreement.  Under Article 28, the effective withdrawal date of the United States is the fastest possible date, given that the agreement entered into force in the United States on November 4, 2016. If it had decided to withdraw from the UNFCCC, it could be informed immediately (the UNFCCC came into force in 1994 for the United States) and come into force a year later.
On August 4, 2017, the Trump administration officially announced to the United Nations that the United States intends to withdraw from the Paris Agreement as soon as it has a legal right to do so.  The formal declaration of resignation could only be submitted after three years of implementation of the agreement for the United States in 2019.   The upcoming United Nations CONFERENCE on Climate Change, to be held in Madrid, is a milestone in bringing the Paris Agreement to life.