Eco-anxiety is increasingly recognized as a significant psychological phenomenon among adolescents, reflecting their deep concern about climate change and environmental degradation. This chapter delves into the concept, the generating factors, and implications of eco-anxiety in young people, examining the dual role of eco-anxiety as both a psychological barrier and a potential catalyst for environmental action. On one hand, eco-anxiety has been observed to paralyze, leading to inaction due to the overwhelming nature of environmental crises. On the other hand, eco-anxiety can act as a catalyst for pro-environmental behaviours, motivating young individuals to engage in actions that mitigate these threats. We discuss how the perception of the severity of the environmental threat and belief in a personal capacity to effect change influence mobilization towards pro-environmental behaviour. Additionally, the chapter identifies the need for targeted interventions to support adolescents in transforming their anxiety into action. Applying strategies that enhance group identity and social norms, we explore how eco-anxiety can be transformed into a constructive force for environmental engagement among young individuals.