Bonn Climate Change Conference 2026 (UNFCCC First sessional period 2026 / SB64)

The 64th sessions of the UNFCCC Subsidiary Bodies (SB64) take place June 8–18, 2026 at the World Conference Center Bonn in Bonn, Germany, bringing together government delegations, technical climate experts, civil society observers, and business representatives for mid-year climate negotiations. The sessions unite the Subsidiary Body for Implementation (SBI) and Subsidiary Body for Scientific and Technological Advice (SBSTA)—the two principal technical bodies supporting the climate negotiation process—to advance Paris Agreement implementation including mitigation strategies and carbon markets, adaptation planning and loss-and-damage finance, climate finance mechanisms, transparency protocols, and technology development and transfer for developing countries. Official registration opened February 9, 2026, with delegate confirmation deadline June 7. The conference serves as the essential technical forum between annual COP sessions, allowing negotiators to advance technical agreements forming the foundation for political decisions at December's COP, coordinate climate finance pledges, establish adaptation priorities, and finalize carbon trading mechanisms.