This study describes the development of a climate change SSIBL-STEAM program that was aligned to the Grade 6 elementary school national curriculum using the ADDIE model for design. The efficacy of the climate change SSIBL-STEAM program was investigated by measuring the impact of the program on cultivating elementary students' personalities (sociality, morality, emotion) and STEAM (Science, Technology, Engineering, Arts, Mathematics) competencies (convergence, creativity, challenge, caring). Twenty-five Grade 6 students and three public elementary school teachers participated in this study. Data were collected using two instruments designed to examine character and STEAM competencies before and after the program. Additionally, field notes and student learning outcomes were collected and qualitatively and quantitively analyzed. The results indicated that students improved significantly in their character and STEAM competencies, especially morality, emotion, and convergence factors. This study was expected to be an example of the combined approach with SSIBL and STEAM.