What is the key concept for this section? What are the major advantages of urbanization? Explain why most urban areas are unsustainable systems and how these factors contribute to their...

What is the key concept for this section? What are the major advantages of urbanization? Explain why most urban areas are unsustainable systems and how these factors contribute to their unsustainability: lack of vegetation, water supply problems and flooding, pollution, health problems, the heat island effect, and light pollution. What is noise pollution and why is it an urban problem? Describe the major aspects of poverty in urban areas. Summarize Mexico City’s major urban and environmental problems and what government officials are doing about them.