The urban population of the world has grown rapidly from 751 million in 1950 to 4.2 billion in 2018. Asia, despite its relatively lower level of urbanisation, is home to 54% of the world's urban population . Some cities have experienced population decline in recent years. Most of these cities are located in the low- fertility countries of Asia, where overall population sizes are stagnant or declining, as observed in a few cities in Japan and the Republic of Korea , which experienced a population decline between 2000 and 2018 . By 2030, the world is projected to have 43 megacities with more than 10 million inhabitants, most of them in developing regions. However, some of the fastest-growing urban agglomerations are cities with fewer than
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report