Gannon University, located in downtown Erie, Pennsylvania, created a middle level teacher preparation curriculum focused on sustainability. After reviewing the literature about learning, teacher preparation, and barriers to campus greening, the article describes how Education for Sustainable Development (ESD) was integrated into the middle level teacher preparation curriculum. The curriculum engages students in the science, technology, engineering, and mathematics (STEM) disciplines, meets accreditation standards, meets university academic requirements, and has been awarded special designation by the Pennsylvania Department of Education (PDE). (Contains 1 figure.)