<br><br>The 20th century changed the way we live. Human population went up from 1.5 billion in 1900 to 7 billion in 2010. The hope of a better life drove--and continues to drive--people to urban areas leading to the growth of megacities around the world.<br><br>In India just three metropolises--New Delhi Mumbai and Kolkata--support a total popul...
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