This study investigated whether an Earth Systems-based course focused on raising postgraduate students' awareness of sustainability, from a systems-thinking perspective, would produce graduates with commitment to drive the sustainability agenda forward with a broad perspective. It investigated students' pre and post-course perceptions of sustainability using a pre- and post-course survey, and by analysing the students' reflective journal entries. The findings confirmed those of previous studies in that initially these students did have an enviro-centric view. The study showed that while the students' perceptions had indeed moved towards a broader view of sustainability, many still leaned towards an environmentally focused perspective.