Humanity faces a potential future of catastrophic changes that are a serious threat to the physical and mental health of humans across the world. Distressing emotional responses to the climate crisis are understandable and our understanding of this phenomenon and ways of coping is beginning to develop. This portfolio contributes to the psychological understanding of climate emotions and climate activism and provides further insight into the impact of climate change on humans’ mental health and wellbeing. Part A of this portfolio presents a scoping review exploring the psychological and emotional effects of engaging in climate activism. The findings of this review suggest that climate activists experience a range of conflicting positive and negative emotions. Climate activists may experience burnout if they are not able to balance problem-focused and emotion-focused ways of coping. Additionally, the findings highlights important considerations for clinicians and practitioners recommending climate activism as a way of coping with climate anxiety. Part B of the portfolio presents a mixed methods study that investigated young adults’ experience of climate anxiety and contact with nature. The findings from the survey show a high level of climate anxiety and nature connectedness in the study’s sample. A reflexive thematic analysis of interviews suggested that the experience of climate anxiety can be isolating, and hope can be hard to maintain in the face of uncertainty about the future. Results suggest that young adults benefit from contact with nature and is a constructive way of coping with climate anxiety. There are multiple benefits of contact with nature experienced by young adults and the aims and outcome of spending time in nature are wide-ranging. This has important implications for the development and delivery of nature based interventions for young adults experiencing climate anxiety. Part C presents a summary of clinical practice and assessments completed.