Human destruction of the natural environment and recent technical advances in the life sciences raise urgent questions about our relationship to nature. In light of these questions, developing an adequate philosophy of the environment is a pressing concern. Angela Breitenbach shows that Kant's philosophy of nature provides a rich resource for grounding a contemporary environmental philosophy. Against the widespread view that Kant sees a clear division between humans and nature, the book explores how Kant's conception of nature relies on a vital analogy with human reason. The author concludes by showing how Kant's analogical account of nature can enrich current debates in environmental ethics and the philosophy of biology.