… 1 The world's fastest growing cities March: Our most read blog of the year saw IIED fellow David Satterthwaite discover, with … the world’s fastest growing cities between 2000 and 2020. In this blog, part of a series on the transition to a predominantly urban world … That's our top 10 – but there were many more! To see all our 2020 blogs, visit our News and Comment page . Previous years Click on the …