The combination of study abroad and service-learning opportunities has been described as transformational when student perspectives shift to a wider world view. One example of an international service-learning program, EARTH (Education and Resiliency Through Horticulture) program, is a school gardening initiative at Gifft Hill School, St. John, U.S. VI. Twenty-one Iowa State University students that participated in the EARTH program responded (91% response rate) to a survey to determine the impact of service-learning on student’s professional development and perceptions of sustainability. The majority of students agreed or strongly agreed that they were challenged to: 1) use critical thinking skills to solve problems (99%), 2) work better with others (80%), and 3) learn more about teaching and educating youth (95%). All students agreed or strongly agreed that they developed new or expanded personal and professional capabilities while on St. John. Ninety-five percent of students agreed or strongly agreed that they learned about conserving resources such as water or soil. Almost 81% agreed or strongly agreed that they use sustainable practices more often at home, and 85% agreed or strongly agreed that they look for ways to limit wasteful uses of resources. This study showed that the service learning during a study abroad program provided a valuable opportunity for undergraduate student development as global citizens.