million cities or megacities
Many megacities are located in Asia, particularly in countries like China, India, and Japan. Examples include Tokyo, Shanghai, and Mumbai. Other regions with megacities include North America (New York City, Los Angeles) and South America (Sao Paulo, Buenos Aires).
Another list defines megacities as urban agglomerations instead of metropolitan areas. As of 2010, there are 25 megacities by this definition, like Tokyo. Other sources list Nagoya and the Rhein-Ruhr as megacities.
Today 408 cities have at least that many inhabitants. And there are 20 megacities with 10 million or more residents.
urban polarization is the process by which megacities become so dominant, they limit urban development elsewhere in the country; they end up becoming closer tied with first world megacities than their own hinterlands. This leads to a process of cumulative causation.
Asia. It contains 15 of the world's 27 megacities (≈56%). The next highest would be Europe with 4.
Who Knew - 2010 Megacities 3-54 was released on: USA: 16 March 2011
People often live in megacities in order to be close to work or to find work. A pressure faced when living in a megacity might include the pressure of long lines for transportation or a high cost of living.
Biggest problems with megacities include: Pollution, proper waste disposal systems, prevention of urban sprawl, proper city planning and the need for adequate muncipal and city resources to combat crime, fires, emergencies and health issues. The biggest problem seen in big cities such as Chicago and New York City is the risk of urban blight which increases crime rates and leaves the city with a host of problems to solve.
As of 2007, there were 18 megacities according to "Living in the Environment, 15th Ed., G. Tyler Miller, Jr." See Chapter 23 on Urbanization and Transportation. It's possible that this information is now considered to be outdated. It should be noted that megacities can alternatively referred to as megalopolises.
Two of South America's megacities are Sao Paulo and Buenos Aires of Brazil. The third South American megacity is Rio de Janeiro, Argentina.
What causes the color to become hot