The quality of each country on track to meet its obligations under the Paris Agreement can be continuously monitored online (via the Climate Action Tracker and the Climate Clock). Once ratified, the agreement will require governments to submit their emission reduction plans. They will eventually have to do their part to keep global temperatures well below 2°C above the pre-industrial period and “make efforts” to limit them to 1.5°C. The United States played an important role in the design and negotiation of the Paris Agreement and signed it in 2015. As signatories, the United States has committed to reducing emissions by 26% to 28% by 2025 compared to 1990 levels. However, in 2017, the federal government announced its intention to withdraw from the agreement after a new government took office and on November 4, 2020, the United States was the only nation to withdraw. The implementation of the agreement by all Member States is assessed every five years and the first evaluation will take place in 2023. The result will be used as a contribution to member States` new national contributions.  The inventory will not be one of the contributions/performance of each country, but of a collective analysis of what has been achieved and what remains to be done.
Economy, because developing countries like China and India were not involved. Without the participation of these three countries, the effectiveness of the treaty has proven limited, as its objectives cover only a small fraction of all global emissions. . . .