The disparity between students' high levels of environmental knowledge and their uneven application of eco-friendly behavior at SMAN 8 Banjarmasin, an Adiwiyata school close to a river, is the driving force for this study. This study aims to quantify the association between eco-friendly behavior (variable Y) and environmental awareness (variable X). Using a sample of 278 students selected using the Proportionate Stratified Random Sampling technique, this study employs a quantitative correlational approach. Likert scales were used to gather the data, and Pearson correlation and descriptive statistics were used for analysis. The study's findings show that: (1) students' environmental awareness is rated as Very Good (97.5% in the Good & Very Good category); and (2) students' eco-friendly behavior is rated as Good, although there is a knowing-doing gap where 20.1% of students' behavior is subpar. (3) The two variables have a strong, positive, and significant association (r = 0.661; p < 0.001). According to the coefficient of determination (R2), 43.7% of ecologically beneficial behavior is influenced by environmental knowledge. In summary, awareness is a key predictor, but other factors also have a big impact on how students behave. As a result, habit-formation-focused therapies are required.
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