Can updated climate pledges limit warming well below 2°C?

Science. 2021 Nov 5;374(6568):693-695. doi: 10.1126/science.abl8976. Epub 2021 Nov 4.

Yang Ou¹, Gokul Iyer¹, Leon Clarke², Jae Edmonds¹, Allen A Fawcett³, Nathan Hultman^{2

4}, James R McFarland³, Matthew Binsted¹, Ryna Cui², Claire Fyson⁵, Andreas Geiges⁵, Sofia Gonzales-Zuñiga⁶, Matthew J Gidden^{5

7}, Niklas Höhne^{8

9}, Louise Jeffery⁶, Takeshi Kuramochi^{8

10}, Jared Lewis^{11

12

13}, Malte Meinshausen^{11

12

13}, Zebedee Nicholls^{11

12

13}, Pralit Patel¹, Shaun Ragnauth³, Joeri Rogelj^{7

14}, Stephanie Waldhoff¹, Sha Yu¹, Haewon McJeon¹

¹ Joint Global Change Research Institute, Pacific Northwest National Laboratory and University of Maryland, College Park, MD, USA.
² Center for Global Sustainability, School of Public Policy, University of Maryland, College Park, MD, USA.
³ US Environmental Protection Agency, Washington, DC, USA.
⁴ US Department of State, Washington, DC 20520, USA.
⁵ Climate Analytics, Berlin, Germany.
⁶ NewClimate Institute, Berlin, Germany.
⁷ International Institute for Applied Systems Analysis, Laxenburg, Austria.
⁸ NewClimate Institute, Cologne, Germany.
⁹ Environmental Systems Analysis Group, Wageningen University and Research, Wageningen, Netherlands.
¹⁰ Copernicus Institute of Sustainable Development, Utrecht University, Utrecht, Netherlands.
¹¹ Australian-German Climate and Energy College, The University of Melbourne, Parkville, Victoria, Australia.
¹² School of Geography, Earth and Atmospheric Sciences, The University of Melbourne, Parkville, Victoria, Australia.
¹³ Climate Resource, Northcote, Victoria, Australia.
¹⁴ Grantham Institute, Imperial College London, London, UK.

Abstract

Increased ambition and implementation are essential.