"Cities in Southeast Asia, Eastern Africa and on US West Coast need to act on sea-level rise most urgently".[Leioa (Spain), 4th May 2017] For people and insurance companies alike, it is the extreme events – with low probability but highly damaging - that are the most devastating. Storm Desmond, for example, flooded northwestern areas of the UK in 2015, and Hurricane Katrina wreaked catastrophe on New Orleans in 2005. The same is true when it comes to future sea level rise. Now a study assesses coastal flood risk from sea level rise for 120 major coastal cities, and shows which cities are most vulnerable to extreme events.