AR6 Synthesis Report: Climate Change 2023


AR6 Synthesis Report (SYR)

The IPCC is currently in its Sixth Assessment cycle, during which the IPCC will produce the Assessment reports of its three Working Groups, three Special Reports, a refinement to the methodology report and the Synthesis Report.  The Synthesis Report will be the last of the AR6 products, due for release in late 2022 or early 2023.

According to IPCC procedures the Synthesis Report (SYR) should “synthesise and integrate materials contained within the Assessment Reports and Special Reports” and “should be written in a non-technical style suitable for policymakers and address a broad range of policy-relevant but policy-neutral questions approved by the Panel”. It is composed of two parts, a Summary for Policymakers (SPM) of 5 to 10 pages and a Longer Report of 30 to 50 pages.

The AR6 SYR is based on the content of the three Working Groups Assessment Reports: WGI – The Physical Science Basis, WGII – Impacts, Adaptation and Vulnerability, WGIII – Mitigation of Climate Change, and the three Special Reports: Global Warming of 1.5°C, Climate Change and Land, The Ocean and Cryosphere in a Changing Climate.

AR6 SYR will be finalized in late 2022 or early 2023. Read more

The first Core Writing Team (CWT) meeting was held from 25-29 January 2021 , the second on 16 – 20 August 2022, and the the third on 25 – 29 April 2022.


The Panel at its 41st Session held in Nairobi, Kenya from 24 to 27 February 2015 agreed that it would continue to prepare comprehensive assessment reports every five to seven years and that the scoping of the Synthesis Report – SYR – as well as attention to cross-cutting issues should start at an early stage (IPCC-XLI/4).

Consistent with decision IPCC/XLI-4, a preliminary Scoping meeting for the Sixth Assessment Report (AR6) Synthesis Report (SYR) was held during the AR6 Scoping Meeting in Addis Ababa, Ethiopia, from 1 to 5 May 2017. The Panel at its 46th Session held from 6 to 10 September 2017 in Montreal, Canada, took note of document IPCC-XLVI/Doc.6 which was produced during the scoping meeting.

A dedicated Scoping meeting for the AR6 Synthesis Report was held in Singapore from 21 to 23 October 2019, the outcome of which is included in the AR6 SYR Scoping document IPCC-LII/Doc.10  submitted to the 52nd session of the Panel. It is explained in more detail in the information document  IPCC-LII/INF.12.

The Panel at its 52nd Session held in Paris, France from 24 to 28 February 2020 agreed to the outline of the AR6 SYR as is contained in Annex 1 to Decision IPCC-LII-10.

Core Writing Team

The Core Writing Team (CWT) is the group of authors preparing the Synthesis Report. The list of 30 Core Writing Team members and 9 Review Editors can be found here.

The IPCC Bureau at its 58th Session in May 2020 selected the members of Core Writing Team from the author teams of the three IPCC Working Group and the three Special Reports, reflecting the balance in geographical distribution, gender, and representative of a range of expertise.

The CWT also includes  the Chair, the IPCC Vice-Chairs, the Working Group Co-Chairs, the heads of the Working Group and Synthesis Report Technical Support Units, and the Secretary of the IPCC.

“The biggest simultaneous challenge and opportunity for the Sixth Assessment Report Synthesis Report is the massive increase in public awareness of climate change since the Fifth Assessment Report, and the readiness of governments and other actors to address the challenge,” said IPCC Chair Hoesung Lee, who leads the preparation of the Synthesis Report.

“My main request to you as a member of the Core Writing Team will be to strive to go beyond listing the key findings of the Special Reports and Working Group contributions to AR6, to develop a Synthesis Report document that is a real integration of the AR6 cycle materials,” he said in a letter of welcome to the Core Writing Team members.

The Core Writing Team will prepare the Synthesis Report of the Sixth Assessment Report (AR6) – the document that will integrate all the IPCC reports in the current assessment cycle.

Core Writing Team meetings

Synthesis Report Outline

The SYR outline agreed at the 52nd Panel Session of the IPCC consists of an introduction and three main sections arranged by timeframes.

The first section, ‘Current Status and Trends’, covers the historical and present period. The second section, ‘Long-term Climate and Development Futures’, addresses projected futures up to 2100 and beyond. The final section is ‘Near-term Responses in a Changing Climate’, considers current international policy timeframes, and the time interval between now and 2030-2040.

This structure, substantially different to what was adopted for AR5 SYR, enables a holistic framing that integrates across the Working Groups, better enabling the SYR to cover different aspects of climate change.

Quick links

AR6 Chair’s Vision Paper

IPCC Calendar

Approved outlines


Authors and Review editors