[B]y 2030, New York, Osaka, and Sao Paulo will no longer make the top 10, and Mexico City will barely hang on as the sole representative outside of Asia and Africa. This reflects the major shift driven by the urbanization in Asia and Africa, particularly in India (404 million projected new city dwellers by 2030), China (292 million), and Nigeria (212 million).
Reid Standish provides more details and the above GIF:
North America, Latin America, and Europe will remain the world’s most heavily urbanized regions but Africa and Asia will catch up in the decades beyond 2030. Africa and Asia are home to 90 percent of the world’s rural population. However, as more people urbanize, that figure will shrink dramatically. By 2050, 56 percent of Africans and 64 percent of Asians will live in cities. Asia will account for the largest growth in the sheer number of city dwellers, but Africa will urbanize at a faster rate.
In total, urbanization in Africa and Asia will add 2.5 billion people to the world’s cities.