Personal climate actions do not crowd out collective action and policy support: longitudinal evidence

Individual pro-environmental behaviours are often promoted as a pathway to broader climate engagement, yet critics argue they may divert attention from more impactful systemic solutions. Using four annual waves of longitudinal survey data from Australia (2021–2024; N = 2778), we examined whether everyday climate actions predict collective action and policy support, and whether climate change risk perception, efficacy beliefs, and personal norms moderate these associations. Multilevel models showed that individual actions were consistently associated with greater collective engagement and, to a lesser extent, stronger policy support within the same year. Moderation analyses indicated that individual actions more strongly predicted collective engagement among individuals higher in risk perception, efficacy, and personal norm. In contrast, the association with policy support weakened slightly at higher levels of these moderators, although these moderation effects were very small. Random-intercept cross-lagged panel models provided little evidence of systematic spillover across years, indicating that within-person changes in individual actions did not reliably predict subsequent changes in collective action or policy support. Overall, the findings challenged the crowding-out effect and suggested that increases in individual action do not undermine broader forms of climate engagement.