The Intergovernmental Panel on Climate Change (IPCC) opened this week registration for experts to serve as Expert Reviewers on the First-Order Draft (FOD) of the 2027 Methodology Report on Inventories for Short-lived Climate Forcers.
This Methodology Report, produced by the Task Force on National Greenhouse Gas Inventories (TFI), will provide guidance on measuring anthropogenic emissions from key short-lived climate-forcing substances, including nitrogen oxides, carbon monoxide, and others, which significantly contribute to global and regional air quality and climate change.
Following the Second Lead Author Meeting held in Istanbul in October 2025, the authors of the Methodology report have prepared a first draft, which will be open for experts worldwide to review and provide comments as of early January 2026.
The review of the First Order Draft is the first of multiple review stages foreseen for every IPCC report. The review process is critical in preparing IPCC reports. It helps ensure scientific rigour, the widest range of perspectives, and relevance and guidance for those who compile emissions inventories.
Scheduled for release in 2027, the Methodology Report on Inventories for Short-lived Climate Forcers will be the first methodology report published by the IPCC in the seventh assessment cycle.
“We have more than 140 authors from 50 countries volunteering their time and expertise to develop the first draft of this long-awaited methodology report. We are now seeking experts worldwide to review and provide their comments, thus ensuring that this methodology report will reflect the latest scientific knowledge,” said Task Force on National Greenhouse Gas Inventories Co-Chair Takeshi Enoki.
Expert Review is the first opportunity for experts to engage with the draft report. All review comments submitted by experts or governments are addressed by the authors. The comments and the author responses, together with the drafts, are published after the report is finalised.
“Engagement of Expert Reviewers is vital. Their insights will help authors to consider diverse perspectives and methodological approaches,” said Task Force on National Greenhouse Gas Inventories Co-Chair, Mazhar Hayat.