The sinking of major cities poses significant risks to millions of residents, particularly in regions already vulnerable to severe storms and flooding. Jakarta, for instance, is sinking at an alarming rate of 13.7 millimeters annually, with some areas experiencing rates as high as 42 millimeters. This could render nearly half the city uninhabitable by 2050. Other cities, including Tianjin, Bangkok, Lagos, and Alexandria, are also facing heightened flood risks due to subsidence. The study warns that even small increases in subsidence can exponentially raise the likelihood of flooding, especially during extreme weather events. Without intervention, these trends could lead to widespread displacement and economic losses.