The implementation of the agreement by all Member States is assessed every five years and the first evaluation will take place in 2023. The result will be used as a contribution to member States` new national contributions.  The inventory will not be one of the contributions/performance of each country, but of a collective analysis of what has been achieved and what remains to be done. When the agreement garnered enough signatures to cross the threshold on October 5, 2016, US President Barack Obama said: “Even if we achieve every goal. We will only reach part of where we need to go. He also said that “this agreement will help delay or avoid some of the worst consequences of climate change. It will help other nations reduce their emissions over time and set bolder targets as technology advances, all under a strong transparency system that will allow each nation to assess the progress of all other nations. “  The Paris Conference was the 21st session of the Conference of the Parties to the United Nations Framework Convention on Climate Change (UNFCCC), known as COP 21. The conference concluded a round of negotiations that opened in Durban, South Africa, in 2011, with the aim of reaching a new legal agreement between national governments to strengthen the global response to climate change. A record 150 Heads of State and Government attended the opening day of the conference. However, for COPs 24 or 25, the parties failed to agree on the modalities for implementing Article 6 of the agreement, which deals with the use of carbon markets, and postponed these decisions to COP 26. Under the Paris Agreement, each country must define, plan and regularly report on the contribution it makes to controlling global warming.  No mechanism obliges a country to set a specific emissions target before a given date, but each target should go beyond the targets set previously.
The United States formally withdrew from the deal the day after the 2020 presidential election, although President-elect Joe Biden said America would join the deal after his inauguration.  INDCs become NDCs – national contributions – as soon as a country formally accedes to the agreement. Governments reiterated their earlier call for parties to reflect “their highest possible ambitions” when presenting a new round of NDCs in 2020, but they have yet to adopt rules on the international emissions trading scheme in accordance with Article 6, the last major part of the “regulatory framework” for implementing the Paris Agreement.