Species are going extinct, forests are burning, and children are worried about the future and their peers worldwide. But that is not the whole story: One Friday in 2018, a few young people joined Greta Thunberg to protest, and the global climate strike movement was born. Scientist David Fopp spent 250 Fridays with the newly formed grassroots movement. Together with activists Isabelle Axelsson and Loukina Tille, he offers an insider perspective on this fight for a globally just and sustainable society. They also turn their focus to science and our political engagement: How can research in all disciplines help with this struggle? And how can we all fight the climate crisis by transforming and deepening democracy?