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Climate Change 2021; The Physical Science Basis



January, 2021


  • Intergovernmental Panel on Climate Change


The Working Group I (WGI) contribution to the Sixth Assessment Report (AR6) of the Intergovernmental Panel on Climate Change (IPCC) focuses on a full and comprehensive assessment of the physical science basis of climate change, based on evidence from more than 14,000 scientific publications available by 31 January 2021. This Report reflects recent climate science advances resulting from progress in, and the integration of, multiple lines of evidence, including: in situ and remote observations; paleoclimate information; understanding of climate drivers and physical, chemical and biological processes and feedbacks; and global and regional climate modelling; as well as advances in methods of analyses and insights from the growing field of climate services. The AR6 WGI Report builds on the WGI contribution to the IPCC’s Fifth Assessment Report (AR5) in 2013, and the AR6 Special Reports1 released in 2018 and 2019. The report considers the current state of the climate in the long-term context, the understanding of human influence, the state of knowledge about possible climate futures, climate information relevant for climate-related risk assessment and regional adaptation, and the physical science basis on limiting human-induced climate change.


IPCC, 2021: Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [Masson-Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M.I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J.B.R. Matthews, T.K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 2391 pp. doi:10.1017/9781009157896


Intergovernmental Panel on Climate Change

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Intergovernmental Panel on Climate Change