Young people are key stakeholders in the future, but their stake is rarely considered in decision making and policy development. In this paper we explore how climate change education can allow the voices of young people to be listened to and help young people imagine desirable futures and develop agency to address the steps, both personal and policy based, that are needed to achieve this. Initially reporting on the findings of a survey of 985 young people (aged 7-18 years from across the UK), we explore what young people currently know about climate change. Informed by this data, we then present a creative approach to backcasting, using a participatory action pedagogical approach to explore the desired futures that 150 young people aged 8-11 years have about the fast fashion industry. We suggest that within the context of fast fashion and other climate related industries, such a methodology could enable educators to address climate change without provoking eco-anxiety and provide a way that decision makers in industry and government can listen to young people's voices.