This article proposes that children constitute a new climate precariat. This conceptualization contributes to a more comprehensive theoretical understanding of the vulnerability of children in relation to the climate crisis. Previous literature tends to treat climate change in an abstract fashion that renders today’s children invisible. Climate precarity consists of three main elements of vulnerability: temporality problems, insecurity and an identity vacuum. In relation to temporality and security, children are suffering from the potential loss of a sustainable future, which spurs the need for urgent action and constant consciousness – in the present. World leaders’ inaction creates an uncertainty regarding whom should be held responsible for taking action in guaranteeing children the future which climate change is at risk of depriving them. The concept of climate precarity could be used to explain children’s collective action in relation to the climate crisis. Children’s concerns in relation to the climate crisis suggest that agency and empowerment are spurred through their resistance towards these vulnerabilities.