Climate Change Research ›› 2021, Vol. 17 ›› Issue (6): 636-643.doi: 10.12006/j.issn.1673-1719.2021.224

• Special Section on the Sixth Assessment Report of IPCC: WGI • Previous Articles     Next Articles

Interpretation of the IPCC AR6 WGI report in terms of its context, structure, and methods

CHEN Deliang(), LAI Hui-Wen   

  1. Department of Earth Sciences, University of Gothenburg, Gothenburg 405 30, Sweden
  • Received:2021-09-29 Revised:2021-10-25 Online:2021-11-30 Published:2021-10-28


The IPCC Working Group I (WGI) contributes to the Sixth Assessment Report (AR6) with the most up-to-date physical understanding of the climate system and climate change, integrating multiple lines of evidence from paleoclimate, observations, process understanding, and global and regional climate simulations, and documenting the latest advances in climate science. It aims to deliver relevant content and knowledge about how climate has changed in the past, and what role human activity has played in these changes, and what is to be expected in the future given a set of emission scenarios based on different socioeconomic paths we will choose. These are important and relevant for policymakers, including climate change mitigation, regional adaptation planning based on a risk management framework, and the global stocktake coming up in 2023. In this interpretation of the report, we intend to introduce the main features of the AR6 WGI report in terms of its context, structure, and methods. Compared with previous reports, AR6 offers more integrated and actionable information and understanding, greater emphasis on regional climate change, and better-constrained climate sensitivity estimates. One of the most important conclusions of this assessment is that the influence of human activity on the warming of the climate system has evolved from theory to established fact.

Key words: IPCC AR6 WGI report, Structure, Context, Methods

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