The Paris Agreement is a bridge between current policy and climate neutrality before the end of the century. The 2015 Paris Climate Change Conference (COP 21) catalyzed an unprecedented vision of combating climate change and engagement by a wide range of non-state actors, including businesses and investors, sub-national governments and civil society organizations. Governments have taken a series of measures in … 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. At the 2015 Paris conference, at which the agreement was negotiated, developed countries reaffirmed their commitment to mobilize $100 billion a year to finance climate by 2020 and agreed to continue mobilizing $100 billion a year by 2025.  The commitment refers to the existing plan to allocate $100 billion per year to developing countries for climate change adaptation and climate change mitigation.  A study published in 2018 shows a threshold where temperatures could reach 4 or 5 degrees (ambiguous formulation, continuity would be 4 to 5 degrees Celsius) compared to pre-industrial levels, thanks to self-amplifying feedbacks 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.