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Description: Here, we provide you with a postprint and with supplemental material (including materials, data and SPSS-Syntax) to the manuscript "Collective efficacy increases pro-environmental intentions though increasing self-efficacy" by Jugert et al (2016). If you like to get in contact with us, please write an email to philipp.jugert@uni-leipzig.de Abstract: We discuss prior findings that enhancing perceptions of collective efficacy encourages pro-environmental behaviour. We suggest that collective efficacy manipulations affect pro-environmental intentions through increasing both collective and self-efficacy. Four experiments conducted in Germany and Australia demonstrated that collective efficacy manipulations can increase pro-environmental intentions by increasing the perception that one’s group - and, through this, the self - is capable of effecting change. We also provide evidence that collective efficacy manipulations only work when they simultaneously raise self-efficacy. Our findings contribute to the environmental literature by showing the mechanisms through which group efficacy appeals work. Our findings also support theorizing on group-based control by showing that personal control can be derived from group sources.