Our planet is increasingly urban. Approximately 50% of the world’s people now live in urban areas. In many regions of the world, the rate of urbanization is declining; however, individual cities, metropolitan regions, and urban areas continue to grow (in number, extent and population). In this context, urban ecology is an important approach to environmental science and sustainable development. People throughout the world practice urban ecology. These people are motivated by a desire to create healthy human ecosystems and livable communities in which to live, work, and play. This semester, we will study some of these people, projects, and places. Key questions: What is an urban ecosystem? Are cities sustainable environments? What are civic stakeholders, local communities, and global society doing to ensure that urban and urbanizing landscapes are healthy and desirable places for today’s world?