Distinctively economic objectives for lifelong education, especially adult learning and education, feature prominently in policy-making agendas and educators' practice in much of the world. Critics contend that humanistic and holistic visions of lifelong learning for all have been marginalised and neglected. The current turn of political attention to issues of planetary environmental sustainability and to global societal transformation and interconnectedness raises further questions and prospects. Two United Nations' publications in 2015: UNESCO's "Rethinking Education: toward a global common good?" and of the United Nations' "Transforming our world: the 2030 Agenda for Sustainable Development" pose intersecting concerns for lifelong learning and environmental sustainability. This article engages with those questions in particular regard to the role of adult learning and education. It discusses a field study of non-formal adult education in Ghana. The field study contributes evidence that resiliently humanistic conceptions and practices of non-formal adult education practically succeed to foster transformation, development and human flourishing. That effective humanism gives credence to the ambitiousness of UNESCO and UN agenda for transformation and sustainability and informs international debates.