Climate change poses an urgent threat to future generations. Children are more susceptible to its effects than adults, with immediate and lifelong impacts on their physical and mental health. In addition to having direct experiences of climate impacts, children and youth respond psychologically in troubling ways to their awareness of the climate crisis. Children’s and youth’s needs for support vary across contexts. Climate impacts are generally greater in the developing world (despite the fact that people there are less responsible for causing the crisis), where capacity to prepare for and adapt to the effects is weaker. Hence, we need urgent action on both mitigating climate change and adapting to its impacts. In doing this work, we must acknowledge and build the agency and engagement of children and youth, which also builds resiliency and hope. Although many programs are encouraging, they fail to reach all children in need and are limited in terms of evaluation. Experts in child development can help fill these gaps. In the developed world, few studies address how to support young people in face of their feelings regarding climate change. Listening and providing opportunities for active engagement are among the ways adults can help young people cope, and build a sense of efficacy and a capacity to tackle the crisis and adapt to climate impacts. The upsurge in school strikes for climate action demonstrates young people’s deep concerns about their future and their determination to prevent a climate catastrophe. The climate change crisis raises questions about how professionals committed to the well‐being of the next generation should respond—business as usual is no longer an option, and many valuable ways exist to help ensure that children can thrive on a livable planet.