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This study compared the person and national-level personality correlates of environmental engagement. Associations between specific personality traits and environmental concern have been observed in a number of studies, but few have examined associations between the Big Five personality traits and environmental engagement. Associations at the individual-level were examined with the environmental value ‘protecting the environment’ (Study 1) and retrospective self-reports of electricity conservation behaviour (Study 2) in national probability samples. Country-level indices of sustainability, environmental attitudes, and harmony values were related to aggregate personality traits with data across nations (Study 3). Across both persons and nations, Agreeableness, Conscientiousness and Openness to Experience were the traits most strongly linked to environmental engagement. These findings provide insight …