The purpose of this article is to explore an understanding of hope that seeks to bridge the gap between a contemplative and action-oriented approach to hope. The argument is based in particular on an extensive study of the literature concerning the work of Jonathan Sacks. His reading of hope reaches back to the narrative of the Exodus and highlights several key assumptions to do with the principle of radical uncertainty. The intention is to situate these assumptions within the context of climate change. Most notably, Sacks’ concept of hope reveals a transformative response to climate change in which people gradually change their identity. For Sacks the key instrument of transformation for both religious and secular is a public Sabbath. An example of such is provided and Sacks’ thinking is set alongside the work of some leading theologians.