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On 15 September 2017, a call for nomination of authors was sent to governments, observer organizations and IPCC Bureau Members. They were asked to submit their nominations via their focal point before Friday 27 October 2017 (midnight GMT +1).

The Working Group I Bureau met  on 29 January to select the author teams. The IPCC Bureau met on 30 January 2018 to agree on the selected list of authors.

The full list of Authors and Review Editors for the Working Group I contribution by chapter is available here

• Press Release: Selection of Authors for IPCC Sixth Assessment Report
• Press Release: Call for nomination of authors
• Leaflet: Nomination of authors for AR6

Lead Author Meetings

• First Lead Author Meeting: Guangzhou, China, 25 – 29 June 2018
• Second Lead Author Meeting: Vancouver, Canada, 7 – 12 January 2019
• Third Lead Author Meeting: Toulouse, France, 26 – 31 August 2019

All IPCC reports undergo two stages of review. A First Order Draft is reviewed by experts. Following the expert review, authors develop a Second Order Draft based on the comments received. This draft then undergoes a second review by both governments and experts. Authors will prepare a Final Draft based on the comments received during the second review. The Final Draft is distributed to governments at the time of the final government review of the Summary for Policymakers.

The First Order Draft of the Working Group I contribution to AR6 has undergone an expert review ( 29 April – 23 June 2019). The Second Order Draft is scheduled to be reviewed by governments and experts from 2 March to 26 April 2020.

• Guidance Note for the Expert Review of the IPCC AR6 Working Group I Report (29 April 2019)
• Press Release: First Draft of Working Group I contribution to Sixth Assessment Report opens to Expert Review

The scoping meeting for the Sixth Assessment Report (AR6) took place in Addis Ababa (Ethiopia) from 1 to 5 May 2017. The draft outlines were approved by the Panel when it met in September 2017

The approved outline of the Working Group I contribution to the Sixth Assessment Report is available  here 

A call for nomination of experts  to attend the scoping meeting was issued to governments, observer organizations and IPCC bureau members. They were requested to submit their nominations via their focal points before midnight (CET) on 31 October 2016. The deadline was later extended to Monday 14 November 2016

In order to determine robust areas of consideration, participants in the Scoping Meeting had a broad understanding of climate change and related issues, and collectively had expertise in the following areas:

Working Group I

• Climate system (atmosphere, ocean, land surface, cryosphere): observations (past and present), processes, and interactions.
• Natural and anthropogenic drivers of climate change (land use, well-mixed greenhouse gases, short-lived forcers including aerosols), carbon and other biogeochemical cycles.
• Climate modelling, model evaluation, predictions, scenarios and projections, detection and attribution, on global and regional scales.
• Earth system feedbacks and dynamical responses, including abrupt change.
• Climate variability, climate phenomena and teleconnections, extremes and implications for regional climate.

Cross-cutting areas of expertise

• Co-benefits, risks and co-costs of mitigation and adaptation, including interactions and trade-offs, technological and financial challenges and options.
• Ethics and equity: climate change, sustainable development, gender, poverty eradication, livelihoods, and food security.
• Perception of risks and benefits of climate change, adaptation and mitigation options, and societal responses, including psychological and sociological aspects.
• Climate engineering, greenhouse gas removal, and associated feedbacks and impacts.
• Regional and sectorial climate information.
• Epistemology and different forms of climate related knowledge and data, including indigenous and practice-based knowledge.

Regional expertise

• Africa
• Europe
• Asia
• Australasia
• North America
• Central and South America
• Polar regions
• Small islands
• Ocean

Nominations page

On 21 September 2016, the IPCC Secretariat sent out a pre-scoping questionnaire to governments and observer organizations to identify policy relevant questions and scientific and technical topics to be addressed in the Sixth Assessment Report (deadline: 30 November 2016, extended to 12 December 2016). The responses received were synthesized and made available to the participants of the AR6 Scoping Meeting and the Panel.

• Chair’s Vision Paper