In this book, David Ray Griffin undertakes to show why process thought--meaning process philosophy, theology, and social/economic thought--provides a natural and helpful context in which to expound and defend the ecological message in the pope's encyclical. In concise arguments, Griffin shows that the position of Whitehead-based process thought on climate change and related matters is remarkably similar to that of Pope Francis in the encyclical. This similarity is important for two reasons. First, as process thought and the pope's encyclical come out of very different traditions, the similarity allows each to add credibility to the other. Second, process thought, which embodies a long-standing type of philosophical theology that is consistent with today's best science and has been growing in influence, can be used to support dimensions of the pope's encyclical that might be rejected by secular minds.