This article discusses whether it is rational and valuable to have hope in the face of the climate crisis. The aim is to explore a distinctive Kantian perspective characterized by three main elements. First, hope is not seen primarily as a means of sustaining action, but action is viewed as a condition for rational hope. Second, the value of certain ‘fundamental’ hopes is not merely instrumental but derives from their constitutive role in our practical identity. Here, I focus on Kantian (...) hope in the compatibility of our fundamental ends, happiness and morality. Third, the rationality of such a hope presupposes trust – in particular, trust that our conceptions of morality and the good life are sufficiently flexible to adapt to drastically new circumstances. (shrink)