This study exemplifies a STEM model for engaging students in environmental sustainability programs through a problem-solving approach. The study employed a mixed-method approach incorporating 346 elementary students. The research findings demonstrated a significant improvement in post-test scores, revealing augmented students' understanding of environmental issues. Observations of students' tasks, and students' and facilitators' feedback illustrated enhanced students' collaborative problem-solving (CPS) attitudes. Conclusively the successful implementation of CPS skills through a week-long course has been demonstrated by a strength, weaknesses, opportunities, & threats (SWOT) analysis. Thus, this study paves the way for the future development of E-STEM-based problem-solving programs.