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

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

Certainly! Describing the environmental benefits and challenges of urbanization requires gathering information from reliable sources. Here's where you can look:

1. Academic Databases: Websites like JSTOR, Google Scholar, or ScienceDirect provide access to a wide range of scholarly articles on various topics, including urbanization and its environmental impacts. You may need access to these databases through a library or educational institution.

2. Government Websites: Check the websites of government agencies responsible for urban planning, environmental protection, or sustainable development in your country or region. They often publish reports, studies, and policy documents that discuss the environmental aspects of urbanization.

3. Nonprofit Organizations and Think Tanks: Look for reputable organizations like the World Wildlife Fund (WWF), Greenpeace, or Urban Land Institute. These organizations often conduct research and publish reports addressing urbanization and its environmental consequences.

4. Books and Publications: Visit your local library or search online bookstores for books and publications dedicated to urbanization, sustainability, or environmental science. Authors like Jane Jacobs, Edward Glaeser, or Richard Florida have written extensively on urbanization.

5. Academic Journals in Environmental Sciences: Journals such as Environmental Science & Technology, Environmental Pollution, or Environmental Impact Assessment Review regularly publish research articles on urbanization's environmental effects.

Remember, while searching these sources, use appropriate keywords like "urbanization and environmental benefits," "urbanization and environmental challenges," "sustainable urban development," or "urbanization impacts on ecosystems" to find relevant information. It is essential to cite your sources properly and critically evaluate the information you find.