On August 4, 2017, the Trump administration formally informed the United Nations that the United States intends to withdraw from the Paris agreement as soon as it has the right to do so.  The formal declaration of resignation could not be submitted until after the agreement for the United States came into force on November 4, 2019 for a three-year date.   On November 4, 2019, the U.S. government filed the withdrawal notice with the Secretary-General of the United Nations, custodian of the agreement, and formally withdrew from the Paris Agreement a year later, when the withdrawal came into effect.  After the November 2020 elections, President-elect Joe Biden promised to reinstate the United States in the Paris Agreement for his first day in office and renew the U.S. commitment to climate change mitigation.  The agreement stipulated that it would only enter into force (and thus become fully effective) if 55 countries that produce at least 55% of global greenhouse gas emissions (according to a list drawn up in 2015) 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. The text of the Paris decision states that the Article 6.4 mechanism should be based on “the experience and lessons learned from the existing mechanisms and approaches of the Convention and the legal instruments associated with it.” This is a reference to the Kyoto Protocol. The Paris Agreement (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 and was signed in 2016. The language of the agreement was negotiated by representatives of 196 States Parties at the 21st UNFCCC Conference of parties held at Le Bourget, near Paris, France, and agreed on 12 December 2015.   Since February 2020, all 196 UNFCCC members have signed the agreement and 189 have left.  Of the seven countries that are not parties to the law, Iran and Turkey are the only major emitters. For many years, small islands have been calling for market mechanisms to go beyond compensation to achieve a measurable net reduction that the atmosphere really sees: a real reduction in emissions. Discussions in Articles 6.2 and 6.4 of the Paris Labour Programme, which is to be agreed here at COP24, must now do so. Adaptation issues were at the forefront of the paris agreement.
Collective long-term adaptation objectives are included in the agreement and countries must be accountable for their adaptation measures, making adaptation a parallel element of the mitigation agreement.  Adaptation objectives focus on improving adaptive capacity, resilience and vulnerability limitation.  “The fact is that the Paris Convention could be fined if nothing has been agreed on Article 6.4.