Behavioral Commitment to Environmental Protection: A Study of Active and Nonactive Members of the Sierra Club

Compared differences between 47 active and 46 nonactive Sierra Club members in their early experiences and role models, experience of harm, political orientation, perception of political efficacy, participation in other organizations, values, reasons for joining, and social dimensions of membership. Variables for which significant differences were found include club-related friendships, values, perceptions of the efficacy of citizen action, feeling personally harmed by an environmental problem, political orientation, and activity in other organizations. Results are discussed in terms of 2 explanations for involvement: differences between groups existing prior to membership and differences in experiences after becoming members.