INDCs become NDCs – Nationally Determined Contributions – once a country formally accedes to the agreement. There are no specific requirements on how countries should reduce their emissions or to what extent, but there have been political expectations regarding the nature and severity of the targets set by different countries. As a result, national plans vary considerably in scope and ambition, largely reflecting each country`s capacities, level of development and contribution to emissions over time. China, for example, has pledged to reduce its carbon emissions by 2030 at the latest and to reduce carbon emissions per unit of gross domestic product (GDP) by 60 to 65 percent by 2030 compared to 2005 levels. India has set a target of reducing emissions intensity by 33-35% from 2005 levels and producing 40% of its electricity from non-fossil fuels by 2030. If the US were to join the agreement, it would be technically necessary to set up an NDC within 30 days. Developed countries have committed themselves under the UNFCCC to support mitigation and adaptation efforts in developing countries. Under the Copenhagen and Cancún Accords, developed countries committed to mobilize $100 billion a year in public and private financing for developing countries by 2020. Adopted in 1992, the UNFCCC is a treaty between governments that forms the basis of global climate efforts. The convention, which enjoys near-universal adherence, has been ratified by the United States with the approval of the Council and the Senate. The convention set a long-term goal (avoiding “dangerous human intervention in the climate system”), established principles to guide global efforts, and committed all countries to “mitigate” climate change by reducing or avoiding greenhouse gas emissions.
The Paris Agreement sets out how countries will implement their commitments under the UNFCCC after 2020. On June 1, 2017, President Trump announced his intention to withdraw the United States from the agreement. In response, other Governments strongly reaffirmed their commitment to the agreement. U.S. cities, states, and other nonstate actors have also reaffirmed their support for the agreement and pledged to step up their climate efforts. The United States officially began its withdrawal from the agreement on November 4, 2019; the revocation took effect on November 4, 2020. President-elect Biden has promised to join the Paris Agreement as soon as he takes office. Article 28 of the Agreement allows parties to 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. Many countries have indicated in their INDCs that they intend to use some form of international emissions trading to implement their contributions. To ensure the environmental integrity of these transactions, the agreement requires the parties to follow accounting practices that avoid double counting of “internationally transferred mitigation results.” In addition, the agreement introduces a new mechanism that contributes to containment and support for sustainable development and could generate or certify tradable emission units, depending on its design. However, Turkey has chosen to ratify the agreement only as a developing country, although it falls under Annex I of the Convention group applicable to industrialized countries that were members of the Organisation for Economic Co-operation and Development (OECD) in 1992. It could be argued that the ratification decision and its timetable are intended only to receive financial assistance, especially since the aid is granted on the basis of the status of the ratifying country. Therefore, classifying it as a developing country would allow Turkey to take less responsibility when it comes to strengthening its emissions reduction targets for 2030 and mid-century. It would also give Turkey more time and a slower path to reducing emissions. This, in turn, could also suggest that Turkey`s net-zero target for 2053 is unrealistic.
The Paris Agreement is the world`s first comprehensive climate agreement.  In 2013, COP 19 in Warsaw invited Parties to submit their “Nationally Determined Contributions” (INDCs) to the Paris Agreement well in advance of COP 21. These submissions represented the self-defined mitigation targets by each country for the period from 2020 onwards. The final NDCs have been submitted by each party after its formal ratification or adoption of the Agreement and are registered in a UNFCCC registry. To date, 186 parties have submitted their first NDCs. On June 1, 2017, President Trump announced that the United States would withdraw from the agreement, but also signaled his willingness to renegotiate the agreement or negotiate a new one. Other countries reiterated their strong support for the Paris Agreement, saying they were not open to further negotiations. The United States officially began withdrawing from the Paris Agreement on November 4, 2019; it entered into force on 4 November 2020. Both the EU and its Member States are individually responsible for ratifying the Paris Agreement. A strong preference has been expressed for the EU and its 28 Member States to simultaneously deposit their instruments of ratification to ensure that neither the EU nor its Member States commit to fulfilling obligations that belong exclusively to each other, and fears of disagreements over each Member State`s share of the EU-wide reduction target – as well as the UK`s vote to leave the EU-wide the EU could delay the Paris Pact.  However, the European Parliament approved the ratification of the Paris Agreement on 4 October 2016, and the EU deposited its instruments of ratification on 5 October 2016 with several EU Member States.  Adaptation issues were further emphasized in the preparation of the Paris Agreement.
Collective long-term adaptation objectives are included in the agreement and countries are held accountable for their adaptation measures, making adaptation a parallel component of the agreement with mitigation.  Adaptation objectives focus on improving adaptive capacity, increasing resilience and limiting vulnerability.  It is rare that there is consensus among almost all nations on a single issue. But with the Paris Agreement, world leaders agreed that climate change is driven by human behavior, that it poses a threat to the environment and all of humanity, and that global action is needed to stop it. A clear framework has also been put in place for all countries to make commitments to reduce emissions and strengthen these measures over time. Here are some key reasons why the deal is so important: Since Trump`s announcement, U.S. envoys have continued to participate in UN climate negotiations — as mandated — to solidify the details of the deal. Meanwhile, thousands of leaders across the country have stepped in to fill the void created by the lack of federal climate leadership, reflecting the will of the vast majority of Americans who support the Paris Agreement. Among city and state leaders, business leaders, universities, and individuals, there has been a wave of participation in initiatives such as America`s Pledge, the U.S. Climate Alliance, We Are Still In, and the American Cities Climate Challenge.
Complementary and sometimes overlapping movements aim to deepen and accelerate efforts to combat climate change at local, regional and national levels. Each of these efforts is focused on the U.S. working toward the goals of the Paris Agreement, despite Trump`s attempts to steer the country in the opposite direction. Although the United States and Turkey are not party to the agreement because they have not declared their intention to withdraw from the 1992 UNFCCC, as Annex 1 countries of the UNFCCC, they will continue to be required to produce national communications and an annual greenhouse gas inventory.  A “national communication” is a type of report submitted by countries that have ratified the United Nations Framework Convention on Climate Change (UNFCCC).  Developed countries are required to submit national communications every four years and developing countries should do so.    Some least developed countries have not submitted national communications in the past 5 to 15 years, mainly due to capacity constraints. .