"Nearly half of China's major cities are suffering "moderate to severe" levels of subsidence, putting millions of people at risk of flooding especially as sea levels rise, according to a study of nationwide satellite data released on Friday.The authors of the paper, published by the journal Science, found 45% of China's urban land was sinking faster than 3 millimetres per year, with 16% at more than 10 mm per year, driven not only by declining water tables but also the sheer weight of the built environment."
