Green momentum? An age-period-cohort analysis of support for the environmental movement in 24 countries

Over the past decade, the climate movement and especially action groups like Fridays for Future have been effective in raising awareness of environmental issues and mobilizing protesters, especially among younger age groups. However, it remains unclear whether this recent surge in activism reflects a broader societal shift or if this trend is primarily driven by younger generations. Using data from 24 countries that participated in waves three and four of the International Social Survey Programme Environment Module, this study employs, for the first time, an Age-Period-Cohort (APC) analysis of environmental Public-Sphere Behavior in an international comparative context. Based on Bayesian negative binominal multilevel models, the results provide empirical evidence for a period effect: PSB have indeed increased across generational cohorts and age groups.