A study published in 2018 shows a threshold where temperatures could rise to 4 or 5 degrees (ambiguous expression, continuity would be “4-5 degrees Celsius”) compared to pre-industrial levels, compared to pre-industrial levels, thanks to returns of self-amplitude in the climate system, indicating that this threshold is below the 2-degree temperature target agreed in the Paris climate agreement. Study author Katherine Richardson points out: “We find that in its history, the Earth has never had a nearly stable state, warmer than that of pre-industrial, and suggests that there is a significant risk that the system itself, because of all these other processes, will want to continue warming, even if we stop emissions. This means not only reducing emissions, but much more.  Although mitigation and adjustment require more climate funding, adjustment has generally received less support and has mobilized fewer private sector actions.  A 2014 OECD report showed that in 2014, only 16% of the world`s financial resources were devoted to adaptation to climate change.  The Paris Agreement called for a balance between climate finance between adaptation and mitigation, highlighting in particular the need to strengthen support for adaptation from the parties most affected by climate change, including least developed countries and small island developing states. The agreement also reminds the parties of the importance of public subsidies, as adjustment measures receive less public sector investment.  John Kerry, as Secretary of State, announced that the United States would double its grant-based adjustment funding by 2020.  At the 2011 UN Climate Change Conference, the Durban Platform (and the ad hoc working group on the Durban Platform for Enhanced Action) were created to negotiate a legal instrument for climate action from 2020. The resulting agreement is expected to be adopted in 2015.  On June 1, 2017, President Trump announced his intention to withdraw the United States from the agreement. In response, other governments have strongly reaffirmed their commitment to the Agreement. U.S.
cities, states and other non-state actors also reaffirmed their support for the agreement and promised to further intensify their climate efforts. The United States officially withdrew from the agreement on November 4, 2019; withdrawal came into effect on November 4, 2020. President-elect Biden has promised to reinstate the Paris Agreement after taking office. The agreement recognizes the role of non-partisan stakeholders in the fight against climate change, including cities, other sub-national authorities, civil society, the private sector and others. The Paris Agreement was launched at the signing on April 22, 2016 (Earth Day) at a ceremony in New York.  After the agreement was ratified by several EU member states in October 2016, there were enough countries that had ratified the agreement to produce enough greenhouse gases in the world for the agreement to enter into force.  The agreement came into force on November 4, 2016.  Negotiations on the Paris regulatory framework at COP 24 proved to some extent to be more difficult than those that led to the Paris Agreement, as the parties faced a set of technical and political challenges and, in some respects, applied more to the development of the general provisions of the agreement through detailed guidelines.
Delegates adopted rules and procedures on mitigation, transparency, adaptation, financing, periodic inventories and other Paris provisions. However, they have failed to agree on rules relating to Article 6, which provides for voluntary cooperation between the parties in the implementation of their NDCs, including by applying market-based approaches.