Methodology

To find the megacities facing the greatest challenges in dealing with ecological threats, 24/7 Wall St. reviewed the global think tank Institute for Economics & Peace report Ecological Threat Report 2022. The report identified 20 cities, some already megacities (over 10 million population) and some will become megacities by 2050, with high population growth, low societal resilience, and substantial ecological threats. Several criteria were considered, including population growth, current coping abilities, number and intensity of ecological threats, ranking on the global peace index (GPI), and various measures of violence.

We added estimated gross domestic products for each city in 2020 in U.S. dollars from “The 150 richest cities in the world by GDP in 2020” published by City Mayors, an international research and campaigning think tank dedicated to urban affairs, maintained and financed by professionals in Europe, the Americas, and Asia.

Full citation: Institute for Economics & Peace. Ecological Threat Report 2022: Analysing Ecological Threats, Resilience & Peace, Sydney, October 2022. Available from: http://visionofhumanity.org/resources (accessed 15 Nov. 2022).