Modern environmentalism has left a profoundmark onmoral philosophy by extending the reach of traditional norms and expanding the roster of ethics available to guide our behaviour. Non-anthropocentric theorists extend moral agency beyond today’s human population by applying norms such as justice, fairness, liberty, equity and respect to non-human animals, future generations, other species and ecosystems generally. Environmentalism also provides the basis for new norms such as sustainability, integrity, and precaution, which seek to guide us towards a better world in which the environmental impacts of industrial society are fully considered.