Megacities normally defined as any urban center that has a population exceeding ten million and well economic development.For instances Beijing,New York,Tokyo,Manila,Jakarta and so on.There are between 20-25 megacities worldwide and these numbers is sure to grow in the decade ahead.However,the growing number of megacities cause a lot of ecological,economical and social problems and risks.Waste disposal is often a major issue in these modern megalopolies.The larger the city the more sewage treatment and landfills are needed to handle the mountains of waste and garbage the city will produce everyday.Today,this issue has becoming more serious.Hence,the authorities of megacities are often finding and developing new methods for dealing with this problem.On the other hands,food and fresh water would be one of the major necessities.As we know,billions of inhabitants and their attendant high technology activities and industries create a lot of heat.Therefore,the world-cities will eventually have to deal with heat pollution.
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