‘Going Green: The BIALL Sustainability Working Group’ was a parallel session presented by Christine Baird during the BIALL Annual Conference ‘Gaining the edge: investing in our skillset’, held in Belfast in June 2023. The session aimed to provide an introduction to the newly formed BIALL Sustainability Working Group. The session, and this subsequent article, outlines the group's aims, projects and structure, as well as the wider contexts which motivated the group's establishment. It discusses the ways in which information professionals can develop more sustainable working practices, both individually and by leveraging the power of our professional networks. This paper explores the opportunities for legal librarians to engage in community activism, and the importance of both this concept and of ‘cathedral thinking’ in responding to the climate crisis.