By 2025, there will be eight cities — possibly more — with populations over 20 million. Among them: Shanghai, São Paulo and Mexico City.
Today there are no cities with more than 20 million people, but “in 15 years or so, nearly 40 cities will top the 10-million mark, up from 23 now. By the mid-2020s, cities will be home to more than 70% of the global population (up from 50% now) as more people desperate for work and a better lifestyle flock in, leaving behind poorer rural areas and small towns.
"They will be the most densely packed megacities ever."
See the Letter’s full list and analysis here. Photo by Mike Behnken on Flickr.