The Intergovernmental Panel on Climate Change (IPCC) has opened the second order draft of the Working Group I contribution to the Sixth Assessment Report (AR6) to government and expert review, marking the continued advancement of preparation in the flagship report. The review runs from 2 March to 26 April 2020 and interested experts can register until midnight CET on 19 April at https://apps.ipcc.ch/comments/ar6wg1/sod/register.php. 

IPCC reports go through repeated drafts and reviews to help ensure that the report provides a balanced and comprehensive assessment of the latest scientific findings. 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. IPCC reports undergo multiple stages of reviews, first by experts and then by both governments and experts. Experts who commented on the first draft will also be invited to comment on this second order draft. All expert reviewers will be acknowledged in the published report, due to be finalized in April 2021.

More information on the role of an expert reviewer is available in Annex 1 of Appendix A to the Principles Governing IPCC Work. Additional information explaining the Expert Review process is available here: https://www.ipcc.ch/site/assets/uploads/2017/08/AR6_WGI_FOD_Guidance_Note.pdf