The megalopolis cities 2025

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36 2025 in megacities

Keywords: cities, population, future urbanization, megalopolis, environment

Today half of Earthlings live in megacities, and by 2050, they will be two-thirds of the world population. Such is the alarming assessment made by the urbanization of specialists on the expansion of giant cities at the World Urban Forum organized by UN-Habitat
held recently in Barcelona.

A seemingly irreversible trend

One can designate under the term megalopolis any city whose population is more than 8 million. By this definition, chosen by UNESCO, there were in 23 1995 36 and would be in 2015. By that date, according to Unesco, the number will not change in
industrialized countries. It will however of 17 30 to the less developed regions.

For the geographer Olivier Dollfus, these megacities are two very different according to whether or not to what he calls the WMA (World Archipelago Megalopolitan), a set of large cities that contribute to the management of the world and are a strong symbol of globalization. Megacities are then not only described by their inhabitants but by the functions they perform and their influence on the world. Thus, for example 90% of global financial operations dealing in a limited number of megacities in developed countries.

Megacities and environment

It is no coincidence that certain terms referring to precarious habitats are associated with the largest metropolises in poor countries. Among the best known in France are "favela", coming from Brazil, or "shantytown", a word appeared in Casablanca in the 20 years. 20% and 30% are the percentage of dwellings created in megacities and belonging to "informal construction" *.

This is in large part in this type of habitat that live 2,5 billion people who lack access to a water purification system. And the impact of large urban concentrations on water pollution can generally be measured far beyond their limits, especially downstream of the rivers that cross.

The air quality is another strong challenge of living in megacities. Pollution are not always reached the heights that could be feared, but its impact is often very wide. The pollutants generated in large cities is likely to move and diffuse large distances according to the movements of the atmosphere. An air monitoring network in mega cities was established in 1974, under WHO pulse (World Health Organization) and UNEP (United Nations Environment Programme). It ensures that levels of concern for public health are often exceeded it.

* Source: Habitat II United Nations, Istanbul, 1996

Philippe Dorison

List of megacities in 2025
In millions

TOKYO - 28,9
BOMBAY - 26,3
LAGOS - 24,6
SAO POLO - 20,3
DHAKA - 19,5
KARACHI - 19,4
MEXICO - 19,2
SHANGHAI - 18,0
NEW YORK - 17,6
CALCUTTA - 17,3
DELHI - 16,9
BEIJING - 15,6
MANILA - 14,7
CAIRO - 14,4
LOS ANGELES - 14,2
BUENOS AIRES - 13,9
JAKARTA - 13,9
TIANJIN - 13,5
SEOUL - 13,0
ISTANBUL - 12,3
RIO DE JANEIRO - 11,9
Hangzhou - 11,4
OSAKA - 10,6
HYDERABAD - 10,5
TEHRAN - 10,3
LAHORE - 10
BANGKOK - 9,8
PARIS - 9,7
KINSHASA - 9,4
LIMA - 9,4
MOSCOW - 9,3
MADRAS - 9,1
CHANGCHUN - 8,9
BOGOTA - 8,4
HARBIN - 8,1
BANGALORE - 8,0

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