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IPCC: Expert Review of Second Order Draft of the IPCC AR6 Working Group I

The Second Order Draft (SOD) of the Working Group I contribution to the AR6, Climate Change 2021: The Physical Science Basis is now open for expert review.


UPDATE: IPCC will extend the government and expert review of the Second Order Draft of the Working Group I (WGI) contribution to the Sixth Assessment Report, originally scheduled to run until 26 April 2020, by six weeks to Friday 5 June 2020.

The expert review of the Second Order Draft will take place from 2 March to 26 April 2020.

If you are interested in Reviewing the SOD please register here until 19 April 2020.

About the AR6 WGI contribution: The Working Group I contribution to the AR6, Climate Change 2021: The Physical Science Basis, will assess large-scale climate changes, climate processes and feedback and regional climate information.

During the review, experts may comment on the structure and comprehensiveness of the report and suggest improvements on the presentation of materials graphically or through tables. They may also propose revisions, relevant additional papers with full citation, and shorten text without losing relevant information.
This version includes the first draft of the Summary for Policymakers.
Report web page

Please note that the SOD is a confidential document which must not be distributed, cited or quoted.

Additional information on the role of Expert Reviewer is available in Annex 1 of Appendix A to the Principles Governing IPCC Work. Please also see here an information note explaining the Expert Review process.

If you have any questions about the process, please contact:

- Urs Neu, Swiss Academy of Sciences,
- Andreas Fischlin, Vice-Chair IPCC WG II,
- Working Group I Technical Support Unit,
- IPCC Press Office, Email:
- Jonathan Lynn, + 41 22 730 8066, Werani Zabula, + 41 22 730 8120

Please send a copy of your review to Urs Neu ().



  • Dr. Urs Neu
    ProClim − Forum sur le climat et les changements globaux (ProClim)
    Maison des Académies
    Case postale
    3001 Berne

  • Prof. Dr. Andreas Fischlin
    ETH Zürich
    Institute of Integrative Biology (Institute of Integrative Biology (IBZ))
    Systemökologie CHN E 21.1
    Universitätstrasse 16
    8092 Zürich