41 individual transilience in the face of climate change Self-efficacy and Outcome Efficacy for Climate Change Adaptation. We included the same items as in Study 1. Support for Local and National Adaptation Policies. We slightly adapted the items from Study 1. Specifically, participants rated to what extent they support or oppose implementing adaptation policies in their municipality. Two items regarding funds and investments were rephrased to stress that the money would come from taxes, hence that participants would pay themselves for them (see Appendix B). We used a separate item to assess to what extent participants support ‘implementing national policies aiming to protect US citizens from climate change risks’. Individual Climate Change Adaptation Intentions and Behaviours. We slightly adapted the items from Study 1. Specifically, we asked participants to what extent they intend to engage in adaptation behaviours within the next year. Further, we removed behaviours that participants themselves would not realistically engage in (i.e., preparing an evacuation plan) or that were not clearly linked to climate change adaptation (i.e., house maintenance; see Appendix B). Participants rated items on a scale from 1 = not at all, to 7 = very much. We included the option 8 = I already did it as an indicator of adaptation behaviour. We calculated the intentions score (for the behaviours not yet performed) by averaging the 7 items into a reliable scale, after converting the value ‘8’ to missing. We calculated the behaviours score by counting the number of behaviours for which ‘8’ was selected. Collective Climate Change Adaptation Intentions and Behaviours. Six items assessed collective adaptation behaviours that people engage in as a group (e.g., ‘Joining a community initiative to make my neighbourhood greener to better protect against climate change risks, for example, by planting trees, building green roofs or parks’; see Appendix B). We introduced the items by specifying that there are actions that communities can take to reduce the negative effects of climate change, and we asked participants to what extent they intend to take the measures within the next year together with their community. The response format, and the procedure to create the intentions and behaviours scale, respectively, was the same as for individual adaptation behaviours. Political Collective Action. Participants indicated to what extent they are willing to engage in two political forms of collective action (e.g., ‘Participating in a demonstration in favour of climate change adaptation policies, namely policies aiming to protect people against climate change risks’, adapted from van Zomeren et al., 2019) on a scale from 1 = not at all to 7 = very much. 2
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