The growing climate crisis has shown how children and young people can be a political force to be reckoned with. While Greta Thunberg and many other young climate activists from around the world personify this force, there is another - largely hidden - story to be told about the everyday practices that young people adopt, in our homes, in our schools and in local communities to respond to environmental concerns. This issue brings together leading commentators to advance the future direction of research into young people's everyday climate crisis activism. In this editorial introduction, we outline some of the new terrains for research, analysis and action that these articles collectively open up. The journal Children's Geographies invites scholars to consider it as a place for the publication of articles that respond to the agenda-setting outlined in this collection and further advance work on young people's everyday climate crisis activism.