This is the first book-length treatment of the metaphysical foundations of ecological ethics. The author seeks to provide a metaphysical illumination of the fundamental ecological intuitions that we are in some sense `one with' nature and that everything is connected with everything else. Drawing on contemporary cosmology, systems theory and the history of philosophy, Freya Mathews elaborates a new metaphysics of `interconnectedness'. She offers an inspiring vision of the spiritual implications of ecology, which leads to a deepening of our conception of conservation.