This book sets out the essential features of a new kind of philosophy, now beginning to take hold among younger generations, that will have a beneficial impact on the earth's natural and human environment. Philosophers usually stick to conceptual ideas without much attention to the messy details of worldly reality, ideas that are wonderful in themselves, but in need of confrontation with the actualities of natural and human history. In these pages, concern is directed especially to the values we hold toward our natural environment, and in particular toward the global problem of climatic warming. Philosophy can inform us not just about deciding how we should live, but about how our values will influence future prospects for the natural world from which we gain sustenance and much of our spiritual inspiration.