Corrigendum: Youth Attitudes and Participation in Climate Protest: An International Cities Comparison Frontiers in Political Science Special Issue: Youth Activism in Environmental Politics - Prendergast, Kate; Hayward, Bronwyn; Aoyagi, Midori; Burningham, Kate; Hasan, M. Mehedi; Jackson, Tim; Jha, Vimlendu; Kuroki, Larissa; Loukianov, Anastasia; Mattar, Helio; Schudel, Ingrid; Venn, Sue; et al. (Frontiers in Political Science, 2021)