Full definition
TRACC sets warming levels, measured against the pre-industrial period, on which French public and private actors size their decisions: +2 °C in 2030, +2.7 °C in 2050 and +4 °C in 2100 for mainland France and Corsica. Overseas values are lower (French Guiana +3.5 °C in 2100, Réunion and Mayotte +2.9 to +3.0 °C), as land warms faster than the ocean. Corresponds to a trend scenario of around +3 °C globally in 2100. Published with PNACC 3 on 10 March 2025, it then had no legal force. Decree No. 2026-23 and the Order of 23 January 2026 wrote it into the Environmental Code. It is not automatically enforceable: it becomes binding as planning documents, impact assessments, natural risk prevention policies and infrastructure standards are revised. PCAET is the first document expected to incorporate it, by 2030. DRIAS portals and Météo-France’s ClimaDiag Commune service apply its three horizons. Do not confuse it with IPCC scenarios (global projections) or with a corporate decarbonisation pathway, which concerns emissions rather than the climate experienced.
Also known as
- Trajectoire de réchauffement de référence
- trajectoire de référence pour l'adaptation
Key figures
- +2.7 °C in 2050warming level selected for mainland France and Corsica, relative to the pre-industrial period
- +4 °C in 2100long-term trajectory horizon, for a global scenario around +3 °C
- 23 January 2026Decree No. 2026-23 and Order writing the trajectory into the Environmental Code