Check these Google search pages.
http://www.google.com/search?hl=en&ie=ISO-8859-1&q=environmental+advantage+urban
http://www.google.com/search?hl=en&ie=ISO-8859-1&q=environmental+advantage+cities
http://www.google.com/search?hl=en&ie=ISO-8859-1&q=environment+cities
http://www.google.com/search?hl=en&ie=ISO-8859-1&q=environment+cities+challenge
I have been searching the web, I am supposed to "describe environmental benefits and challenges of urbanization." Do you know where I can look?
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