This book invites the Christian tradition to participate in an urgent and rapidly developing area of enquiry: the significance of human feeling in a time of climate crisis and global ecological collapse. The author turns in particular to climate and ecological grief and mourning, proposing that the theological frame of sorrow helps illuminate the moral and political weight of such experiences. The book introduces four ways that Christian theology has thought about the passion of sorrow, each providing a touchpoint for approaching anthropogenic loss: love, moral formation, compassion, and resistance. The author argues for the particular theological significance of human feeling towards non-human creatures, proposing that sorrow reflects human knowledge of creation as gift; other creatures offer themselves to us and demand that we human creatures offer ourselves in response. When sorrow for the earth is therefore offered in prayer and in public, it not only helps see non-human creatures with new eyes but also radically reimagines our understanding of being a human. The volume will be of particular interest to scholars of theology, religion, and the environment.