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Understanding how psychological processes drive human energy choices is an urgent, and yet relatively under-investigated, need for contemporary society. A knowledge gap still persists on the links between psychological factors identified in earlier studies and people's behaviors in the energy domain. This research applies a meta-analytical procedure to assess the strength of the associations between five different classes of individual variables (i.e.,: attitudes, intentions, values, awareness, and emotions) and energy-saving behavioral intentions and behaviors (self-reported and actual). Based on a systematic review of studies published between 2007 and 2017, we estimate the average effect size of predictor-criterion relations, and we assess relevant moderators and publication bias, drawing on data obtained from 102 independent samples reported in 67 published studies (N = 59.948). Results from a series of five single meta-analyses reveal a pattern of significant positive associations between the selected psychological determinants and energy-saving indicators: associations between individual-level predictors and energy-saving outcomes are positive and moderate in size, ranging from large effects for emotions to small-moderate effects for pro-environmental values. Interestingly, moderation analysis reveals, among other things, that attitude-behavior links are not statistically significant when actual behavior is considered as an outcome. Implications for policy interventions are discussed.

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Personal pro-environmental action has often been explained in terms of personal cost-benefit analyses and personal capabilities. However, given that only collectives and not single individuals can effectively address large-scale environmental crises, such as mass extinction of species, peoples’ pro-environmental motivation might emerge from their perceived involvement in agentic collectives, as proposed in the social identity model of pro-environmental action (SIMPEA). Collective cognition and motivation (e.g., ingroup identification, ingroup norms, collective efficacy, and group-based emotion) might drive identified group members’ nature protection intention and behavior both directly and indirectly by affecting personal factors (e.g., personal attitudes). We tested this in two related nationally representative surveys of N = 2065 Germans, measuring both personal and collective predictors as well as nature protection intentions and behavior on either the regional or the worldwide, global level. As hypothesized, blockwise regression analyses suggest that collective factors affect people’s conservation action both directly and indirectly. In addition, participants’ identification with all humanity moderated the relationship between collective factors and personal intention (and personal norms) to protect global nature. Overall, the results support propositions of the social identity model of pro-environmental action and highlight the importance of collective factors motivating citizens’ conservation action.

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