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Abstract
Fossil CO2 emissions in 2021 grew an estimated 4.2% (3.5%–4.8%) to 36.2 billion metric tons compared with 2020, pushing global emissions back close to 2019 levels (36.7 Gt CO2).
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1 Department of Earth System Science, Woods Institute for the Environment, and Precourt Institute for Energy, Stanford University , Stanford, CA 94305-2210, United States of America
2 College of Engineering, Mathematics and Physical Sciences, University of Exeter , Exeter EX4 4QF, United Kingdom; Département de Géosciences, Laboratoire de Météorologie Dynamique, Institut Pierre-Simon Laplace, CNRS-ENS-UPMC-X, Ecole Normale Supérieure , 24 rue Lhomond, 75005 Paris, France
3 Tyndall Centre for Climate Change Research, School of Environmental Sciences, University of East Anglia , Norwich Research Park, Norwich NR4 7TJ, United Kingdom
4 CICERO Center for International Climate Research , PO Box 1129 Blindern, 0318 Oslo, Norway
5 Global Carbon Project, CSIRO Oceans and Atmosphere , Canberra, ACT 2601, Australia
6 Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ , Versailles, Versailles, France
7 Department of Earth System Science, University of California at Irvine , Irvine, CA 92697, United States of America
8 Department of Earth System Science, Tsinghua University , Beijing 100084, People’s Republic of China