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The agreement stipulates that it would only enter into force (and therefore fully operational) if 55 countries emitting at least 55% of global greenhouse gas emissions (according to a list established in 2015) [65] ratify, accept, approve or accede to the agreement. [66] [67] On April 1, 2016, the United States and China, which together account for nearly 40% of global emissions, made a joint statement confirming that the two countries would sign the Paris climate agreement. [68] [69] 175 parties (174 states and the European Union) signed the agreement on the first day of its entry for signature. [59] [70] On the same day, more than 20 countries made a declaration of intention to accede as soon as possible in order to accede in 2016. With ratification by the European Union, the agreement obtained enough parts to enter into force on 4 November 2016. 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. “[27] [28] Under the Paris Agreement, each country must define, plan and report regularly on the contribution it makes to the fight against global warming.