After a decade of building skyscrapers, Shanghai is now the world’s most densely populated city. But now the city is sinking. “The rock bed is about 300m from the surface and the underground water table is higher, about 1-1.5 m from the surface. There are now more than 4,000 buildings more than 100m tall in Shanghai. That results in extremely severe ground settlement.” It’s just one of the reasons why city planners are now desperately trying to halt the architectural annexation of Shanghai’s skies. Dearth of greenery, horrible pollution, inadequate transport and an almost unbearable press of humanity on the streets are others.”