megacities timeline

new york and tokyo were the only megacities (with more than 10 million inhabitants)

mexico city, sao paulo and osaka became megacities

now there are over 20 megacities spanning almost every continent

today, there are 32 megacities - urbanisation is hapening faster that at any time in human history - asia accounts for over half of today's megacities

nearly 9% of the world's population will live in 41 megacities but it is in africa where some of the most rapid urbanisation will take place in the future