Purpose: The purpose of this research was to discover the impacts of taught environmental sustainability-focused geography postgraduate programmes on student attitudes, behaviours and practices in relation to environmental awareness within two research-intensive universities in the UK. Design/methodology/approach: A case study involved online surveys to measure environmental attitudes, behaviours and practices at the start and end of four taught geography postgraduate programmes. Findings: There was widespread attitudinal change and an increasing prioritisation of environmental issues reported among participants after they had completed their programme. However, behavioural change was limited, and there was little evidence of greater awareness being translated into changed practices. The learning benefits included a greater focus on interdisciplinarity, holistic thinking and critical self-reflection. Practical implications: The findings demonstrate that postgraduate taught (PGT) programmes in sustainability improve student awareness and concern about environmental issues but do not necessarily lead to widespread behavioural change. This raises questions for programme convenors about how education for sustainability can be truly transformational and avoid leading students to develop eco-anxieties over the scale of change required. Originality/value: There is a lack of research engaging with students on PGT programmes, especially in understanding their impacts on environmental attitudes, behaviours and practices. The research provides an evidence base for understanding the effects of PGT programmes in challenging student values, attitudes and practices and by implication knowledge transfer post-graduation, with the potential to help protect the environment and identify ways of living better with the ever-changing planet.