Green Thomism seeks to offer a path toward an “ecological conversion” whereby one permits one’s relationship with Jesus Christ to enlighten attitudes about the created world around us. It is an attempt to recover key claims at the heart of St. Thomas’ vision of reality that brings his thought into dialogue with modern ecological concerns. Rooted in Aquinas’s understanding of creation as an ordered, purposeful whole sustained by God, Green Thomism emphasizes the intrinsic goodness and intelligibility of the natural world, not merely its usefulness to humans. It also defends a robust account of human embodiment, i.e., the organicity of the body as an inescapable feature of all human rationality. It draws on Thomistic concepts such as natural law and the interconnectedness of all beings to argue that humans have a moral responsibility to care for the environment as stewards rather than exploiters. By integrating Aquinas’s metaphysical and ethical framework with ecological awareness, Green Thomism offers a theological foundation for environmental responsibility as an essential and permanent feature of Catholic doctrine and practice.