The term Sustainability loosely organizes a diverse mix of issues relating to the science, politics, and business of how humans can endure on Earth. Sustainability is about carrying capacity: making resource decisions without compromising the ability of future generations to make their own resource decisions. Sustainability thus requires an understanding of the systems whose carrying capacities matter for human endurance; three prominent and interconnected systems are the environment, the economy, and society. Sustainability also requires an understanding of the decision-making that operates on these resource systems and affects their carrying capacities. In sum, the study of Sustainability requires an introduction to environmental science, energy production, human settlements, economic development, social justice, policy development, and international relations. This course will provide that introduction though a weekly lecture series drawing on scholars from across the university and a small group project that addresses a real problem confronting an institution in Philadelphia.