Climate change, which is currently further accelerated by increasing global warming, has led to numerous reactions within societies and politics. Within societies, but closely tied to and impacting the political sphere, one reaction to climate change developments is the desire of people, especially young people, to place something against their growing insecurity and fear regarding the future through activism. Observable is the clear need to be able to act, to have agency, in the face of a possibly disastrous future or, perhaps, of a non-future. This contribution considers selected activist groups such as Fridays for Future and the group The Last Generation, which operate in Germany, Austria and Switzerland, to show the variety in which climate activism can be articulated and performed. The (young) activists often see themselves as lone fighters called upon to save the world or as pioneers for a ‘better world’ in which they can live. In this sense, also figuratively in their self-perception, they occupy a diaspora position within European societies as they seem to be a small group of (young) activists who are only supported by a few others, while the majority of society does not join their climate protest in such an intensive manner. This is not to demean what we typically understand as diasporas but to take the concept of diaspora and see how it may apply to the context we elaborate and analyse here. In addition to an examination of both the common and different goals of various climate activist movements in Germany (and Europe), the contribution provides a classification of the origins and the organizational structure of these movements. It thereby considers the influence of global developments on the movements themselves as well as the movements’ global influence on others such as young people who are attracted by the activists’ example to demonstrate climate protection on the streets. Based on the analysis, a further desideratum of this chapter is to formulate an inventory of possible opportunities and challenges for society and politics that arise from these movements, their objectives and actions. In particular, it is important to clarify whether and to what extent some of the actors and goals are or could become extremist. The contribution thus elucidates both opportunities and risks of climate activists’ movements, to offer a more solid basis for potential ways forward in terms of actions and policy.