The effects of climate change, such as air pollution and extreme heat events, can adversely affect the physical and mental health of children and young people at all ages. This article explores the effects of climate change on children and young people's development and explains the effects of air pollution and heatwaves on their health. The article also discusses how children and young people are knowledgeable and concerned about the effects of climate change and can offer new perspectives on addressing these effects. Finally, the authors consider the role of nurses in raising awareness of the adverse effects of climate change on children's health, incorporating climate change in their practice and promoting opportunities for children's involvement in healthcare decision-making, strategies and policy development.