While the agreement has been welcomed by many, including French President Francois Hollande and UN Secretary-General Ban Ki-moon, criticism has also emerged. James Hansen, a former NASA scientist and climate change expert, expressed anger that most of the agreement is made up of « promises » or goals, not firm commitments.  He called the Paris talks a fraud with « nothing, only promises » and believed that only a generalized tax on CO2 emissions, which is not part of the Paris agreement, would force CO2 emissions down fast enough to avoid the worst effects of global warming.  It will also allow the parties to gradually strengthen their contributions to the fight against climate change in order to achieve the long-term objectives of the agreement. Article 28 of the agreement allows the parties to terminate the contract following a notification of an appeal to the custodian. This notification can only take place three years after the agreement for the country comes into force. The payment is made one year after the transfer. Alternatively, the agreement provides that the withdrawal of the UNFCCC, under which the Paris Agreement was adopted, also withdraws the state from the Paris Agreement. The terms of the UNFCCC`s exit are the same as those of the Paris Agreement. There is no provision in the agreement for non-compliance. The Paris Agreement has an « upward » structure unlike most international environmental treaties, which are « top down », characterized by internationally defined standards and objectives that states must implement.  Unlike its predecessor, the Kyoto Protocol, which sets legal commitment targets, the Paris Agreement, which focuses on consensual training, allows for voluntary and national objectives.  Specific climate targets are therefore politically promoted and not legally binding.
Only the processes governing reporting and revision of these objectives are imposed by international law. This structure is particularly noteworthy for the United States – in the absence of legal mitigation or funding objectives, the agreement is seen as an « executive agreement, not a treaty. » Since the 1992 UNFCCC treaty was approved by the Senate, this new agreement does not require further legislation from Congress for it to enter into force.  The negotiators of the agreement stated that the INDCs presented at the time of the Paris conference were insufficient and found that « the estimates of aggregate greenhouse gas emissions in 2025 and 2030, resulting from planned contributions at the national level, do not fall into scenarios at 2oC at the lowest cost, but lead to a projected level of 55 gigatonnes in 2030. » and acknowledges that « much greater efforts to reduce emissions will be needed to keep the global average temperature rise to less than 2 degrees Celsius, reducing emissions to 40 gigatonnes or 1.5 degrees Celsius. »  Taking part in an election campaign promise, Trump announced his intention to withdraw the United States from the Paris Agreement in June 2017. , a climate denier who claimed that climate change was a « hoax » perpetrated by China. But despite the rose garden president`s statement that « we`re going out, » it`s not that simple. The withdrawal procedure requires that the agreement be in effect for three years before a country can formally announce its intention to withdraw. She`ll have to wait a year before she leaves the pact. This means that the United States could formally withdraw on November 4, 2020, the day after the presidential elections. Even a formal withdrawal would not necessarily be permanent, experts say.
a future president could join us in a month. The Kyoto Protocol, a pioneering environmental treaty adopted at COP3 in Japan in 1997, is the first time nations have agreed on country-by-country emission reduction targets.