A reconceptualization of education for sustainability and global citizenship education (GCE) is proposed, considering evidence from the United Nations decade of education for sustainable development (ESD) and from research with policymakers and adult educators in Wales. In this reframing, global citizenship education is foregrounded, and the model is underpinned by an ecological ethos, where webs of interconnections are highlighted. The model is informed by critical and holistic adult education, and it includes a focus on relational learning and on the affective domain, where emotions are recognised and valued alongside the rational and cognitive. These elements are supported by an ethic of care, which is introduced as a starting point for making what can appear as abstract concepts or remote issues, immediate and relevant to learners' lived experience. The synthesis of the various theoretical perspectives embodies an inclusive 'ecological global citizenship education', where educators and learners are supported to engage with difficult and emotive topics. Dialogue is proposed as the method at the centre of a pedagogy that is critical and humanistic, and that facilitates and supports the often-uncomfortable learning as we honestly and critically examine ourselves and our world within a learning community.