the world we live in

In 2008, for the first time, half the world’s population is living in urban towns and cities.
By 2030, the urban population will reach 5 billion — 60 per cent of the world’s population. Nearly all population growth will be in the cities of developing countries, whose population will double to nearly 4 billion by 2030 — about the size of the developing world’s total population in 1990.

In terms of population size, Tokyo was the largest urban agglomeration in the world in 2005, with 35 million residents. It is followed today by Mexico City, New York, Sao Paulo and Mumbai . Of these cities, Mumbai is expected to become the second largest mega-city in 2015 with a population of 22 million, followed by Mexico City, Sao Paulo and Delhi.

see Mexico city megaregion...

see the tallest cities in the world...