The magnitude of the problem of environmental degradation and climate change requires a complete rethinking and reorienting of our way of being in the world. Responding to the environmental crisis requires not only a conversion of the will but even more fundamentally a transformation of the imaginationthat is, the capacity to think of other ways of being, thinking, and acting in the world. These essays, by a distinguished group of Catholic scholars, assess the gravity of the situation and offer resources from the biblical and theological traditions for the necessary mobilization of will and the conversion of our imaginations.