The science–education cooperative venture "Our Common Future: 'eKidZ'—Teach Your Parents Well" explores intergenerational learning processes and the transfer of learning from the younger to the older generation. Students acting as multipliers and their multiplication effect on parents is part of the research setting: 20 high school students, in the role of researchers, investigated the question of whether children who participate in the Climate Change Education (CCE) program "k.i.d.Z.21" passed

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... on their climate-change-related knowledge, attitudes and actions to their parents (n = 91), in comparison to a control group (n = 87). Due to the annual increase in student participants in the CCE project "k.i.d.Z.21" since 2012 (n = 2000), this article can build on the results of a questionnaire regarding the school year 2017/18 (n = 100–120). A Multivariate Analysis of Variance (MANOVA) showed that the "k.i.d.Z.21" project has a multi-faceted knock-on effect on parents, constituting a multiplier effect: increasing knowledge, and, above all, improvements to the child–parent relationship. Additionally, measurable positive effects in the frequency and quality of climate change communication between children and their parents have been observed (Spearman Rank Correlations), but a distinct lack of positive effects regarding changing climate-friendly attitudes or actions have been noted (Pearson Product–Moment Correlation). The importance of the child–parent relationship is a key factor in bridging the knowledge–action gap, and is reviewed in the context of CCE.