This article discusses critical pedagogy and ecopedagogy, which stimulate active citizenship through the lessons of environmentalism, exposing students to the critique of the underlying power structures of society. This article discusses business ethics and sustainability undergraduate course, which served as a case study applying critical pedagogy and ecopedogogy. Critical pedagogy, developed by the Brazilian educator Paulo Freire rejects the idea that education is ever politically neutral, arguing that teaching is an inherently political act. Ecopedagogy, taking critical pedagogy further to include current environmental challenges, has inspired this educational intervention described in this article. Asked to watch and reflect on a documentary about radical environmentalism, the students demonstrated a certain shift in their understanding of conventional ethics, enshrined in anthropocentrism. Their reflections showed that they were both surprised and to a degree shocked about not just the actions of the “radicals”, but also the role of the state, supported by corporate and political lobbies in suppressing protest and the framing of the term “radicalism”. The article concludes in the reflection on what radical environmentalism can teach business students in their role as active citizens.