The Synthesis Report is the final product of the panel’s Sixth Assessment Report and is scheduled to be finalized in September. According to the IPCC, it is written in a nontechnical style, combining the findings of all three working group contributions to the Sixth Assessment Report, as well as the three special reports produced in the current assessment cycle—Global Warming of 1.5°C, Climate Change and Land, and Special Report on the Ocean and Cryosphere in a Changing Climate.
Experts can review a policymaker summary of up to 10 pages and/or a longer report of up to 50 pages.

Lee
What they’re saying: “The Synthesis Report will bring together all the findings and work of the IPCC during the entire Sixth Assessment cycle,” said Hoesung Lee, IPCC chair. “This is why the review and scrutiny by both governments and experts is such a crucial and critical part of the process. The review will further firm up policy relevance, the scientific integrity and robustness of this closing chapter of the Sixth Assessment cycle.”
The draft report’s core writing team, Lee continued, “has developed a solid and strong draft of the Synthesis Report that experts and governments can comment on. After the review, the core writing team will continue to work hard and address the comments received, despite the challenging circumstances of the pandemic, to prepare the revised draft ready for the final government distribution.”