The IPCC has finalized the first part of the Sixth Assessment Report, Climate Change 2021: The Physical Science Basis, the Working Group I contribution to the Sixth Assessment Report. It was finalized on 6 August 2021 during the 14th Session of Working Group I and 54th Session of the IPCC.
The first of three working groups (WGI) published Climate Change 2021: The Physical Science Basis on 9 August 2021. A total of 234 scientists from 66 countries contributed to this first of three working group reports. The report’s authors built on more than 14,000 scientific papers to produce a 3,949 page report, which was then approved by 195 governments. The Summary for Policymakers (SPM) document was drafted by scientists and agreed to line-by-line by the 195 governments in the IPCC during the five days leading up to 6 August 2021.