ABSTRACT Human-induced climate change poses an unprecedented global threat. Researchers agree that dealing with climate change requires international collective action and widespread social transformation. This study integrates insights from the Social Identity Model of Collective Action (SIMCA) and the Encapsulated Model of Social Identity in Collective Action (EMSICA) to explain participation in the environmental movement, Extinction Rebellion (XR). Structural equation models of data from a survey of 203 current or potential XR activists supported two identity-based pathways to collective action behavior and future intentions: moral convictions → anger → XR identification → collective action and global identification → participative efficacy → XR identification → collective action. Perceived group efficacy predicted collective action intentions but not behavior. Fear, guilt/shame, and hope did not significantly predict collective action behavior or intentions. We discuss the interplay of personal and social identity processes underlying climate change activism, as well as the need for longitudinal and experimental studies to disentangle causal relations. We propose that environmental campaign groups could foster group identification and thence collective action by communicating moral outrage about climate change, together with the potential efficacy of individuals’ actions toward achieving the group’s goals.
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