The last two decades have seen institutions of higher education put increasing emphasis on both internationalizing their institutions and making them more sustainable. While laudable in their own right, there are contradictions and tensions between these goals, in particular when the carbon emissions involved in international activities like study abroad are considered. But there is also potential synergy between these goals. In this article, the authors explore two case studies of programs abroad that seriously engaged both the contradictions and opportunities inherent in the idea of sustainable international education. The first examines environmental politics and ecology in New Zealand and the Cook Islands and the second compares sustainable urban practices in Canada and the United States. Based on the lessons learned from these case studies, the authors argue that partnership between internationalization and sustainability efforts is necessary to help institutions of higher learning become both global and "green." To that effect, the authors discuss specific and concrete ways to "green" study abroad courses throughout this article, particularly within the two case studies and in their concluding discussion of strategies for international educators, faculty, and higher education administrators. (Contains 2 notes.)