The paper aims at developing new understandings of agency, or capacity to make a difference, which is a central issue in childhood studies. Sixteen speeches delivered by climate activist Greta Thunberg between 2018 and 2019 are analyzed. The findings reveal 5 core reflexive operations (objectification, personification, sanctification, unification and diversification) underpinning the speeches. This is conducive to the hypothesis that Greta's audience and the replications of demon-strations for climate justice are bound to 5 transactional horizons (activities, relations, values, images of self and motivations) identified as the symbolic landscapes channeling the social in-teractions in climate activism. Transactional horizons form a structure of intelligible categories linked to sensatory experience. These vectors of agency twist perceptual consciousness into a hi-erarchized reflective consciousness. The dominant perspective of agency within structure is chal-lenged by this emerging paradigm of agency through structure, whereby the two terms are seen as fluid and sedimented states. Future directions are identified for interdisciplinary research, con-tributing to heightened awareness of recursive processes that may impact climate policies.