Urbanization causes various forms of pollution like air, water, and soil contamination. It also leads to other problems like poor housing, poverty, unemployment, and overburdened public systems. However, these issues with urbanization can be addressed by creating public transportation networks, parks, affordable housing, community centers, job opportunities, and getting community input on solutions. The document outlines challenges of urbanization but also provides recommendations for how to plan and take corrective actions to build sustainable communities.