The objective of this research is to offer a qualitative analysis of adult STEAM (science, technology, engineering, the arts and mathematics) learning in a community setting, with a focus on sustainability and climate action. To date, much research on STEAM learning has been directed towards youth and children in formal educational settings. Our qualitative study involving semi-structured interviews with community participants, artists, and scientists over the course of a six-month initiative in Ireland allowed us to develop a rich picture of a multi-faceted STEAM project that held space for both a social change agenda and a learning agenda. In our findings, we identified several contributing factors to transformative learning and changed feelings about climate change, including pride of place, the development of strong interpersonal relationships, and an emerging sense of collective agency through a shared emotional and affective journey. To design for meaningful, community-level climate action, we argue that learning may be supported in, with and through STEAM. Our study also showcases the value of the arts and aesthetic experiences to embrace dissensus when tackling a complex issue like climate change through STEAM education.