The average sea level measured in Ostend rose by around 23.6 cm between 1951 and 2024, or approximately 3.2 mm per year on average, and the increase is accelerating: since 2015, it has exceeded 5 mm per year, according to a report released on Monday by the Centre for Climate Change Risk Analysis (Cerac) and the Institute of Natural Sciences. Sea temperatures have also risen over several decades.