On 4 November 2019, the United States notified the depositary of its withdrawal from the Agreement, which is to take effect exactly one year after that date.  From November 30 to December 11, 2015, the France hosted representatives from 196 countries at the United Nations Climate Change Conference, one of the largest and most ambitious global climate conferences ever held. The goal was nothing less than a binding, universal agreement that would limit greenhouse gas emissions to levels that would prevent global temperatures from rising more than 2°C (3.6°F) above the temperature scale set before the start of the Industrial Revolution. The Paris Agreement was opened for signature on 22 April 2016 (Earth Day) at a ceremony in New York.  After several European Union states ratified the agreement in October 2016, enough countries that had ratified the agreement were producing enough greenhouse gases worldwide for the agreement to enter into force.  The agreement entered into force on November 4, 2016.  Under Article 28 of the Agreement, parties may withdraw from the Agreement after sending a notice of withdrawal to the Depositary. The denunciation may take place no earlier than three years after the entry into force of the Agreement for the country. Payment shall be made one year after notification to the depositary.
Alternatively, the agreement stipulates that a withdrawal from the UNFCCC, under which the Paris Agreement was adopted, would also remove the state from the Paris Agreement. The conditions for withdrawal from the UNFCCC are the same as for the Paris Agreement. The agreement does not specify any provisions in case of violation. Following a campaign promise, Trump – a climate denier who claimed climate change was a “hoax” committed by China – announced in June 2017 his intention to withdraw the United States from the Paris Agreement. But despite the president`s statement from the rose garden that “we`re going out,” it`s not that easy. The withdrawal process requires the agreement to be in force for three years before a country can formally announce its intention to leave. Then he will have to wait a year before leaving the pact. This means that the United States could officially leave on November 4, 2020 at the earliest, one day after the presidential election. Even a formal withdrawal would not necessarily be permanent, experts say; A future president could return to the board in just one month. Under the Paris Agreement, each country must regularly identify, plan and report on its contribution to the fight against global warming.  There is no mechanism requiring a country to set a specific emission target on a specific date, but each target should go beyond the targets set previously.
The United States officially withdrew from the agreement the day after the 2020 presidential election, although President-elect Joe Biden said America would join the agreement after his inauguration.  The Paris Agreement has a “bottom-up” structure unlike most international environmental treaties, which are “top-down” and are characterized by internationally defined norms and goals that must be implemented by states.  Unlike its predecessor, the Kyoto Protocol, which sets commitment targets with the force of law, the Paris Agreement, which emphasizes consensus-building, allows for voluntary, nationally defined targets.  Specific climate goals are therefore promoted politically and are not legally linked. Only the processes that govern the preparation of reports and the consideration of these objectives are prescribed by international law. This structure is particularly noteworthy for the United States – since there are no legal mitigation or funding objectives, the agreement is considered an “executive agreement rather than a treaty.” Since the 1992 UNFCCC treaty received Senate approval, this new agreement does not need new congressional legislation to enter into force.  The Paris Agreement is an agreement of the United Nations Framework Convention on Climate Change (UNFCCC) dealing with the mitigation, adaptation and financing of greenhouse gas emissions and was signed in 2016. The wording of the agreement was negotiated by representatives of 196 States Parties at the 21st Conference of the Parties to the UNFCCC at Le Bourget, near Paris, in France, and adopted by consensus on 12 December 2015.   By February 2020, the 196 members of the UNFCCC had signed the agreement and 189 had become parties.
 Of the seven countries that are not parties to the law, the only major emitters are Iran and Turkey. Unlike the Kyoto Protocol, which sets legally binding emission reduction targets (as well as sanctions for non-compliance) only for developed countries, the Paris Agreement requires all countries – rich, poor, developed and developed – to do their part and reduce their greenhouse gas emissions. To this end, greater flexibility is built into the Paris Agreement: it does not include language in the commitments that countries should make, countries can voluntarily set their emission targets (NDCs) and countries are not penalized if they do not meet the proposed targets. What the Paris Agreement requires, however, is monitoring, reporting, and reassessing countries` individual and collective goals over time in order to bring the world closer to the broader goals of the agreement. And the agreement stipulates that countries must announce their next set of targets every five years – unlike the Kyoto Protocol, which aimed at that target but did not contain a specific requirement to achieve it. Although the agreement was welcomed by many, including French President François Hollande and UN Secretary-General Ban Ki-moon, criticism also surfaced. For example, James Hansen, a former NASA scientist and climate change expert, expressed anger that most of the deal is made up of “promises” or goals, not firm commitments.  He called the Paris talks a fraud with “nothing to do, only to promise” and believes that only a general tax on CO2 emissions, which is not part of the Paris Agreement, would reduce CO2 emissions fast enough to avoid the worst effects of global warming.
 The Paris Agreement is the world`s first comprehensive climate agreement.  The Kyoto Protocol, a landmark environmental treaty adopted at COP3 in Japan in 1997, is the first time that countries have agreed on country-specific emission reduction targets that are legally mandated. .