Shanghai, China’s most developed and richest city, has been sinking into the mud for at least 100 years.
It was one of the first cities in China to suffer serious land subsidence, with an average rate of 22.94 mm/year from 1921 to 2007.
That rate of subsidence has stabilised since 2010, but rising sea levels caused by global warming pose a new and very real threat to the city of 24 million.
