By 2050, coastal areas will be home to 1.4 billion people and 570 cities, some of them vast megapolises, will be at threat from rising water levels, according to the international network C40. Extreme climatic events will only serve to exacerbate the risk of flooding, to which our port cities are increasingly exposed. In the course of the monitoring we carry out on your behalf, we are increasingly seeing the development of strategies inspired directly or indirectly by the “sponge city” concept. The aim is to restore the ground’s natural capacity to absorb water, a capacity that has been largely lost in our cities as a result of urban development, and the use of concrete and asphalt. The main solutions adopted include using porous materials, creating floodable green spaces, restoring wetland areas, and also treating and storing water for re-use during periods of drought. Chinese port cities are among the first cities to have opted for this approach, along with some major industrial groups such as Suez (a member of AIVP), which is helping Chongqing (China) along this path to becoming a resilient port city.