This publication by EADTU's Task Force on Green Campus explores the efforts of distance and open Higher Education Institutions (HEIs) to foster sustainability through green campus initiatives. The report examines how HEIs are reducing their carbon footprint, enhancing energy efficiency, and encouraging sustainable behaviours in education, research, and campus management. Case studies and good practices are integrated to provide a comprehensive view of strategies that promote environmental responsibility within HEIs, offering a roadmap for other HEIs to align with sustainability goals, including the United Nations Sustainable Development Goals (SDGs). The findings emphasise the importance of education for sustainable development (ESD) in shaping future sustainability leaders and promoting global environmental responsibility. Contributing institutions: European Association of Distance Teaching Universities (EADTU) | The NetherlandsUniversity of Jyväskylä (JYU) | FinlandAnadolu University (AU) | TurkeyThe Open University (OU) | The United KingdomUniversidade Aberta (UAb) | PortugalFernUniversität in Hagen (FUH) | GermanyUniDistance Suisse | SwitzerlandUniversité TÉLUQ | CanadaFraunhofer-Institut für Umwelt-, Sicherheits- und Energietechnik (UMSICHT) | Germany