Climate change has become a global emergency, which mental health effects are increasingly being described and understood. Children and adolescents, especially those in low income countries and minority communities, are particularly vulnerable to experience the worst impacts of climate change now and in the coming decades. Our group of early career mental health clinicians and researchers in nine culturally and socioeconomic different countries across three continents initiated a global, online discussion about the effects of climate change on the mental health of children and adolescents, based on literature and our professional experience. We identified a paucity of research and psychiatric education on the topic, and a need to advance global and local efforts in this direction. We also identified three main domains of mental health impact of climate change: direct, indirect, and through physical conditions. Our work offers a preliminary, up-to-date overview of the consequences of climate change on the mental health of children and adolescents, and provides recommendations to advance policies, public health efforts, research, education, and clinical care in the emerging area of 'Climate Psychiatry'.