This Youth Knowledge Book invites the readers – young people, activists, youth workers, educators, researchers and policy makers – to find a way forward to a more sustainable and just society. This publication explores young people’s experiences of the climate crisis and their actions. It comprises seven chapters containing contributions from different authors divided into two parts. The first section explores how young people are engaging in environmental politics, while the second considers how the youth sector could respond to the climate crisis and support young people in their environmental activism across Europe and beyond. The publication also highlights some of the emerging issues related to the climate crisis, such as recognising the unequal impact of climate change on different groups of young people, questions of intergenerational solidarity, links between climate denialism and populism, the rise of eco-anxiety (and other emotions) and, finally, the blurring of the dichotomy between humans and nature.