This study aimed to develop a program to increase pro-environmental awareness, knowledge, and behavior among students at SMAN X in Makassar using the Participatory Action Research (PAR) approach. GREAT began with preparation, socialization, and environmental ambassador (EA) inauguration, then continues with program implementation which consists of five pro-environmental activities, namely Collecting Inorganic and Organic Waste, Cool with Reusable Stuff, Nature Gift Day, Planting and Watering a Tree to Support Green Nature, Upcycling Unused Stuff. After the implementation, a closing ceremony and program evaluation were held through FGD and self-reflection form. Overall, despite certain shortcomings that require attention for future programs, GREAT has effectively heightened awareness, knowledge, and redirected students' intentions toward pro-environmental actions not only in school but also in family and public environments. Additional endeavours are necessary to overcome challenges identified in the planning and execution of forthcoming interventions in other contexts.
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