“Urban metabolism” is the analogy scholars make between cities and living systems. It helps them measure how materials flow into urban areas, are transformed through use, and flow out again as waste. But because cities bring together both human and natural systems, noted theorist Stephanie Pincetl seeks to explain how social, political, and economic contexts affect the physical flow through the urban metabolism. Read blog posts by OU faculty (at https://wp.me/p4a87T-17X) on ideas that have contributed to Dr. Pincetl's thinking, then join them as she presents her views, and they respond.