Save the date for the Open Hour webinar on how to register as an IPCC expert reviewer. The webinar is hosted by CMCC on Tuesday, February 2nd, at 2.30 – 3.30 pm.  Moderated by Anna Pirani (CMCC and Focal Point alternate for Italy, the webinar will feature Giacomo Grassi (Joint Research Centre, JRC) and the Methodology Report on SLCF authors Maria Jose Sanz Sanchez (IPCC TFI Bureau member) and Daniela Romano (ISPRA).

To attend the webinar register here

 

The IPCC Secretariat has opened the expert review of the First Order Draft (FOD) of the 2027 IPCC Methodology Report on Inventories for Short-lived Climate Forcers (SLCF). The review phase represents a core element of the IPCC assessment process, ensuring that the report provides a balanced, comprehensive, and policy-relevant assessment of the latest scientific and technical knowledge.
The Methodology Report is being prepared under the IPCC Task Force on National Greenhouse Gas Inventories (TFI), following the Principles Governing IPCC Work. The report outline was agreed by the Panel at its Sixty-first Session (Sofia, Bulgaria, July–August 2024).

 

Expert review period

Review period: 5 January 2026 – 27 February 2026 (midnight, GMT+1)
Type of review: Expert review only (the government and expert review of the Second Order Draft will follow in the second half of 2026).
The purpose of the expert review is to help ensure the scientific quality, accuracy, and completeness of the report. Reviews are expected to be objective, open, and transparent, and to reflect a wide range of expertise and geographical representation.

 

Who can register as an Expert Reviewer

Experts with relevant scientific, technical, or methodological expertise related to short-lived climate forces are encouraged to register, including expertise on methane, black carbon, tropospheric ozone, emission inventories, atmospheric processes, measurements, and policy-relevant inventory methodologies.
Governments and Observer Organizations are encouraged to promote broad participation. Experts previously nominated for any role in the SLCF Methodology Report but not selected as authors or review editors are also invited to register.

 

How to register

Registration as an IPCC Expert Reviewer is carried out directly through the IPCC online system: https://apps.ipcc.ch/comments/slcf/.

Registration deadline: 13 February 2026 (midnight, GMT+1)

Additional information on the role and responsibilities of Expert Reviewers is available in Annex 1 of Appendix A to the Principles Governing IPCC Work.

For technical questions related to the review process, experts may contact the IPCC TFI Technical Support Unit at nggip-tsu@iges.or.jp.

 

Open Hour Webinar – Expert Review of the SLCF Methodology Report

To facilitate participation and clarify all aspects of the expert review process, the IPCC Focal Point for Italy will host an online Open Hour webinar.

The webinar will be moderated by Anna Pirani, CMCC and Focal Point alternate for Italy, who was recently nominated Lead Author for Chapter 1 of the Working Group (WG) on Impacts, adaptation, and vulnerability of the IPCC Seventh Assessment Report. Dr. Pirani also served as executive editor of the IPCC Special Report on Global Warming of 1.5°C and the IPCC Sixth Assessment Report (AR6) in Working Group I, and was an author of the IPCC AR6 Synthesis Report.

The webinar will feature

• Giacomo Grassi, Joint Research Centre, JRC, IPCC TFI Bureau member.

The webinar includes the participation of authors of the Methodology Report on SLCF:

• Maria Jose Sanz Sanchez, Director of the Basque Centre for Climate Change (BC3), IPCC TFI Bureau member;
• Daniela Romano,  ISPRA, IPCC SLFC Methodology Report CLA

The session will provide an overview of the structure and scope of the SLCF Methodology Report, practical guidance on how to submit review comments, and clarifications on the role and expectations of Expert Reviewers.

The webinar will take place on Tuesday, February 2nd, at 2.30 – 3.30 pm

To attend the webinar register here

Why participate

Participating in the expert review allows reviewers to contribute directly to the scientific robustness of a key IPCC methodological product, support the development of improved and harmonized national greenhouse gas inventories, and engage with an international community of experts contributing to climate policy-relevant science.