I have been searching the web, I am supposed to "describe environmental benefits and challenges of urbanization." Do you know where I can look?

Answer 1

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