The core interest of this dissertation is the constitution of the future-oriented subject in eco-political documentary films. While the genre of feature-length eco-political documentaries has been proliferating since Al Gore’s success with An Inconvenient Truth (2006) at the Academy Awards, feature films as production sites of discursive knowledge are only just starting to gain sociological attention. Located in the borderland between affective narrative and factual representation, eco-political documentaries position themselves as educators of climate futures, inspirers of environmental action and promoters of sustainable lifestyles – as conceptual and practical how-to guides for the future. Building on a grounded theory approach, my reconstructive analysis of feature-length documentaries released between 2006 and 2019 traces how practices of ‘doing future’ in the films are portrayed as inseparable from processes of constituting the self, processes of subjectivation: Engaging with the future becomes engaging with oneself, and developing the self a prerequisite for an alternative future. Considering eco-political documentaries an ‘interpellative genre’, I ask what the represented subject forms (as protagonists, filmmakers, or collectives) suggest who we are supposed to be to create alternative futures, how their processes of becoming relate to specific concepts of the future, and what underlying concept of the human subject informs the narratives. I conclude by discussing how the subjectivities that are advertised as being fit for the future echo the logics of both cultural neoliberalism and posthumanism.