Abstract
Addressing the global climate emergency and an urgent need for psychological research, the present study drew on two major psychological perspectives: social identity theory’s notion of a socially constructed sense of self, and prospect theory’s cognitive heuristics on the asymmetric effects of gain and loss framed messaging. A 2 (Human vs. Environmental Identity) × 2 (Gain vs. Loss framing) factorial experiment (N = 160) sought causal evidence for superordinate identities, gain versus loss framed messaging, and their interactions upon motivations for pro-environmental behavior. Results suggested interaction effects between social identity and message frames on activism, support for environmental policy, and enactment measures. Challenging prospect theory’s original findings, gain framed messages were dominant in enhancing private sustainable behaviors, while loss frames were dominant in enhancing political behaviors. Whereas income was a significant demographic predictor, the overall social psychological findings inform campaign strategies for pro-environmental behavior.