The monitoring covers the expansion of 75 typical cities in China from 1972 to 2020, showing that about 62% of the expansion is on former cultivated land, raising challenges in food production. Chinas urbanization rate is presently at about 60%, there are over 100 cities with 1 million, and 16 cities have 10 million or more inhabitants.

http://www.cas.cn/cm/202103/t20210304_4779487.shtml