Mindfulness has recently been identified as an antecedent of proenvironmental behavior. This study aims to consolidate and expand recent research findings by suggesting that mindfulness is associated with proenvironmental behavior through cognitive reappraisal and climate change awareness. Our findings showed that mindfulness correlated with proenvironmental behavior through both cognitive reappraisal and climate change awareness. Moreover, nature connectedness was found to negatively moderate this relationship: for individuals with greater levels of nature connectedness, the influence of mindfulness on proenvironmental behavior was diminished. Theoretical and practical implications of our findings are discussed.