Individualism is a significant barrier to climate mitigation. We evaluated eleven behavioral interventions aimed at stimulating climate change mitigation, along cultural individualism and collectivism orientations in 63 countries (N=59,440). The more individualistic a nation, the less its residents believed in climate change, supported mitigation policy, and intended to share information (but it it was not related to tree planting in an online task). While some interventions were more effective in individualistic nations (decreasing psychological distance), and some in collectivistic nations (emphasizing social norms), others were effective in both (writing a letter to the future generation). These results reveal that and the efficacy of interventions hinges on cultural contexts. osf.io/preprints/psyarxiv/cv… Led by @dgoldwert Evalina Bao @kim_doell and @vlasceanu_mada