This article proposes a model that describes and frames sustainability commitment. The model is based on didactic theory and pragmatic philosophy and is informed by several empirical studies on environmental and sustainability education (ESE) practice. The intention is for the model to serve as a critical perspective on ESE practices in secondary and upper secondary schools, and to offer a framework for the development of future practice with emphasis on teachers’ choices of content and teaching methods. The model suggests that a sound commitment is situated in the in-tersection of the intellectual, emotional, and practical aspects of sustainability. It is argued that: The intellectual aspect is essential for giving the commitment scientific rigor and a critical stance; emotions are vital for students to become dedicated; and skills to carry out appropriate actions for change is necessary for playing an active role in providing a sustainable transformation of society.