The sustainable development class gives students a thorough grounding in those concepts and places sustainability in an international context. Students spend the first half of the term developing a conceptual model for sustainable development. The second half of the term is then spent testing that model on case studies from around the world and implementing a sustainability project on campus. Past projects include: converting a Biology truck to run on vegetable oil, putting on a fair trade fashion show, hosting a “locavore lunch" (with all food locally grown or produced), and a complete “Green” makeover of the Principia College Center for Sustainability office.