This volume focuses on 'fittingness' as an ethical-aesthetical idea, and in particular examines how the concept is beneficial for environmental ethics. It brings together an innovative set of contributions to argue that fittingness is a significant but under-investigated facet of human ethical deliberation with both ethical and aesthetic dimensions. In widely diverse matters - from architecture to table manners - individuals and communities make decisions based on 'fittingness', also expressed in related terms, such as appropriateness, prudence, temperance, and mutuality. In the realm of environmental ethics, fittingness denotes a relation between conscious embodied persons and their habitats and is of relevance to judgements about how humans shape, and take up with, the non-human environment, and hence to ethical decisions about the development and use of the environment and non-human creatures. As such, fittingness can be of great benefit in reframing human relationships to the non-human, stimulating a way of living in the world that is fitting to the preservation of its fruitfulness, goodness, beauty, and truth.