Saint-Valery-en-Caux, lower quay of the Seine-Maritime, is at the forefront of climate change. Already threatened by runoff from the plateaus, the municipality is currently testing an anti-flood buoy to protect against rising sea levels.

According to the Norman IPCC, the Batellerie quay will be under water for at least 70 days per year in 2100, “and perhaps more often” “Sea level rise is inevitable. One meter by 2100, on one condition: Antarctica does not move, otherwise it's at least two meters”