- Cities worldwide are adding area by converting wetlands and shallow waters into solid land. The world’s major coastal cities added roughly 2,530 square kilometres of land — more than 40 times the size of Manhattan — to their coastlines from 2000 to 2020, reveals a survey of satellite imagery. https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022EF002927 40 comments science