In 2000, there were 18 megacities – conurbations such as Tokyo, New York City, Los Angeles, Mexico City, Buenos Aires, Mumbai, São Paulo, Karachi that had populations in excess of 10 million inhabitants. Greater Tokyo already has 35 million, which is greater than the entire population of Canada.
TOKYO, the largest megacity
THE HISTORY
In 1800, only 3% of the world's population lived in cities, a figure that has risen to 47% by the end of the twentieth century, by 2007, this had risen to 468 cities of more than one million. By 2025, according to the Far Eastern Economic Review, Asia alone will have at least 10 megacities, including Jakarta, Indonesia (24.9 million people), Dhaka, Bangladesh (26 million), Karachi, Pakistan (26.5 million), Shanghai (27 million) and Mumbai (33 million), Lagos, Nigeria has grown from 300,000 in 1950 to an estimated 15 million today, and the Nigerian government estimates that the city will have expanded to 25 million residents by 2015
Growth
For almost a thousand years, Rome was the largest, wealthiest, and most politically important city in Europe. Rome's population passed a million by the end of the 1st century BC.
In the 2000s, the largest megacity is the Greater Tokyo Area. The population of this urban agglomeration includes areas such as Yokohama and Kawasaki, and is estimated to be between 35 and 36 million.
Challenges
This has been caused by massive migration, both internal and transnational, into cities, which has caused growth rates of urban populations and spatial concentrations not seen before in history. These issues raise problems in the political, social, and economic arenas. These record-setting populations living in urban slums have little or no access to education, healthcare, or the urban economy
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