Centre des monuments nationaux warns of climate threats to French heritage

A new report from the Centre des monuments nationaux (CMN) warns that climate change poses a severe threat to France's cultural heritage. The study, released on September 18, 2026, indicates that by 2050, 100% of the 110 sites managed by the CMN will be strongly exposed to heat and water-related hazards under a 2.7°C warming scenario.

Key findings include that 80% of the sites will face more than 30 days per year of conditions favorable to wildfires. Additionally, 52% of sites are expected to be moderately or strongly affected by the swelling and shrinkage of clay, a phenomenon that can destabilize building foundations. The report also predicts an increase in extreme heat, with an additional 14 days per year exceeding 30°C, and a 17% increase in winter precipitation.

Coastal risks are also highlighted, with eight monuments vulnerable to rising sea levels and erosion. For example, the house and garden of Georges Clemenceau in Saint-Vincent-sur-Jard faces potential submersion by the year 2120, while the Château d'Azay-le-Rideau is already susceptible to flooding. Beyond physical damage to structures, the CMN notes that these changes threaten gardens, collections, and the safety of visitors and staff during heatwaves.