The Spanish hospitality industry is facing environmental challenges which require organizations and individuals to learn new skills and practices and create new environmental knowledge. Understanding the nature and role of prior knowledge for sustainable development is a necessary step towards understanding if new environmental practices will be adopted successfully. This research focuses on unlearning and its impact on environmental knowledge by carrying out an empirical investigation of the unlearning context in 127 Spanish hospitality companies. The findings indicate that a process for consolidating emergent understandings would appear to be an intermediary step between the forgetting of old knowledge and the application of new environmental knowledge. Consequently, it is important that managers provide an appropriate unlearning context to support the openness of individuals to new ideas and environmental awareness. Otherwise, individuals may be fearful of or confused by the prospect of unlearning old habits and routines.