Global call for experts: IPCC opens review of the First Order Draft of the 2027 Methodology Report on Short-lived Climate Forcers

The IPCC Task Force on National Greenhouse Gas Inventories (TFI) has opened the expert review process for the First Order Draft of the upcoming '2027 IPCC Methodology Report on Inventories for Short-lived Climate Forcers.' The draft will be available for expert review from 5 January to 27 February 2026.

The report responds to a decision taken at the Forty-ninth Session of the IPCC in Kyoto in 2019, which mandated the development of a dedicated methodology for short-lived climate forcers. Its agreed outline was approved at the Sixty-first Session in Sofia in 2024.

Following a global call for nominations in 2024, Coordinating Lead Authors, Lead Authors and Review Editors were selected from governments and observer organizations. These experts are now preparing the First Order Draft, which will be subject to wide expert review to ensure scientific balance, rigour and broad representation.

The expert review is a core part of the IPCC process. It is designed to be objective, open and transparent. The IPCC aims to involve as many independent experts as possible, ensuring a wide range of perspectives, disciplines and geographical representation. Those previously nominated but not selected for author roles will be contacted separately and invited to participate.

Governments and observer organizations are encouraged to nominate additional experts. Registration is open until 13 February 2026 through the IPCC website. The process applies strictly to expert reviewers. A combined government and expert review of the Second Order Draft will follow later in 2026.

This work is essential to strengthening global methodologies for greenhouse gas inventories and improving the accuracy of national reporting under the Paris Agreement. It also supports science based decision making, a goal strongly aligned with the mission of the InterAcademy Partnership.