IPCC in Bonn: Scientific Expertise for the SB64 Negotiations

From 8 to 18 June 2026 the 64th sessions of the Subsidiary Bodies (SB64) of the UN Framework Convention on Climate Change (UNFCCC) are being held in Bonn. The Intergovernmental Panel on Climate Change (IPCC) is accompanying the talks, bringing up-to-date scientific findings into the political process.

Mandate of the subsidiary bodies

The subsidiary bodies SBSTA (science and technology) and SBI (implementation and policy) prepare substantive bases and organizational decisions for the annual UN climate summit (COP). On the Bonn agenda are, among other things, emissions reporting, adaptation, climate finance, transparency mechanisms and technical guidance. The sessions aim to clarify open questions, align work programmes and set timetables.

Role of IPCC expertise

The IPCC does not make policy recommendations; it assesses research on the climate system, impacts, and mitigation and adaptation options. In Bonn it provides that evidence through short briefings, technical presentations and direct exchanges with delegations. Such assessments inform timelines for emissions reductions, risk evaluations for sectors like agriculture or infrastructure, and the planning of adaptation investments.

Formats and dialogue

In addition to formal briefings, the IPCC organises side events, technical workshops and media briefings. These offerings are aimed at states, observer organisations, civil society and businesses. They translate complex issues into actionable options—for example, risk profiles in coastal regions, uncertainties in modelling scenarios, or linking emissions pathways with social equity considerations.

Dealing with uncertainties

Scientific findings are often expressed with probability and confidence statements. Effective decisions require clear information on uncertainties, time horizons and potential side effects. The IPCC provides standardised terminology and assessment frameworks to support this.

Why the June meetings matter

The Bonn sessions set the technical and political agenda leading up to the next COP. They influence guidance, work programmes and the design of finance for adaptation as well as measures on losses and damages. Success depends on robust science and viable political compromises.

Key issues

On the agenda alongside technical questions are political topics: allocation of financial resources, recognition and response to losses and damages, transparency rules, and the balance between near-term and long-term mitigation goals. Scientific data on emissions pathways, remaining carbon budgets and the consequences of different temperature trajectories form the evidence base; translating that into operational instruments remains a matter for negotiation.

Participation and public visibility

The presence of the IPCC raises the visibility of scientific arguments while also heightening expectations for transparent, rapid progress. Clear communication, open data and accessible summaries help build trust and traceability in the process.

Outlook

Bonn is an important interim stop in the climate calendar. Clear scientific inputs provide orientation for the coming months, even as political priorities shape research questions. The outcomes of SB64 will guide negotiations up to the next COP and set the course for programmes and financing models.