For most of human history, we have lived our daily lives in a close relationship with the land. Yet now, for the first time, more people are living in urban rather than rural areas, bringing about an estrangement. This book, by acclaimed author Jules Pretty, is fundamentally about our relationship with nature, animals and places. It includes a series of interlinked essays that leads readers on a voyage that weaves through the themes of connection and estrangement between humans and nature. The journey shows how our modern lifestyles and economies would need six or eight Earths if the entire world's population adopted our profligate ways. Pretty shows that we are rendering our own world inhospitable and so risk losing what it means to be human: unless we make substantial changes, Gaia threatens to become Grendel. Ultimately, however, the book offers glimpses of an optimistic future for humanity, in the very face of climate change and pending global environmental catastrophe.