This Classroom Action Research (CAR) aims to improve the environmental awareness of fifth-grade students at Nagrak State Elementary School through mutual cooperation (gotong royong) activities. The main problem identified in the field was the high level of environmental moral degradation among students, such as littering and neglect of classroom cleanliness. The research was conducted in two cycles using the Kemmis and McTaggart model. Data were collected through observation, interviews, and a Likert-scale questionnaire from a random sample of 30 students. The results showed a consistent and gradual increase in the average environmental awareness, from an initial level of 43.2% in pre-cycle 1 to a significant increase of 76.2% at the end of cycle 2. The use of peer group dynamics and concrete actions proved effective in shifting theoretical paradigms to pro-environmental behavior.
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