This paper proposes a comprehensive model of determinants of individual environmentally relevant behavior, integrating key theories from environmental psychology. The model, tested using meta-analytical structural equation modeling, includes intentions, perceived behavioral control, and habits as direct predictors of behavior. Intentions are influenced by attitudes, personal and social norms, and perceived behavioral control. Personal norms are predicted by social norms, perceived behavioral control, awareness of consequences, ascription of responsibility, an ecological worldview, and self-transcendence values, with self-enhancement values having a negative impact. The model suggests that interventions should focus on de-habitualizing behavior, strengthening social support, and increasing self-efficacy, rather than solely on attitude campaigns. Value-based interventions have a more indirect effect. The findings highlight the importance of integrating multiple theoretical perspectives to understand and influence environmental behavior effectively.This paper proposes a comprehensive model of determinants of individual environmentally relevant behavior, integrating key theories from environmental psychology. The model, tested using meta-analytical structural equation modeling, includes intentions, perceived behavioral control, and habits as direct predictors of behavior. Intentions are influenced by attitudes, personal and social norms, and perceived behavioral control. Personal norms are predicted by social norms, perceived behavioral control, awareness of consequences, ascription of responsibility, an ecological worldview, and self-transcendence values, with self-enhancement values having a negative impact. The model suggests that interventions should focus on de-habitualizing behavior, strengthening social support, and increasing self-efficacy, rather than solely on attitude campaigns. Value-based interventions have a more indirect effect. The findings highlight the importance of integrating multiple theoretical perspectives to understand and influence environmental behavior effectively.