>In the next 25 years, Africa is projected to add around 900 million new urban residents — more than the current urban population of Europe and the United States combined. The scale and speed of this growth are historically unprecedented

https://www.sciencedirect.com/science/article/pii/S222658562...

"estimated that approximately 500–550 million rural residents had transformed into cities and towns from 1978 to 2017 in China"

and if we add newly born in the cities then it would result in about the same number of new urban residents.