How sustainable are modern human lifestyles? What would the world be like if they were more sustainable? How could we create such a world through the choices that we make as citizens, professionals, and consumers? Students leave traditional academic disciplines behind as they seek answers to these questions in this more than merely interdisciplinary course. By learning how to diagnose and to prescribe effective responses to sustainability challenges large and small using systems thinking, backcasting, and other holistic strategies, students also learn how they can contribute to the emergence of societies that facilitate, enhance, and sustain indefinitely the well-being of human individuals, their communities, and their environments.