The Holberg Lecture by Holberg Laureate Martha C. Nussbaum was held on 8 June, 2021. Animals suffer injustice at our hands: the cruelties of the factory farming industry, poaching and trophy hunting, assaults on the habitats of many creatures, and innumerable other instances of cruelty and neglect. Human domination is everywhere: in the seas, where marine mammals die from ingesting plastic; in the skies, where migratory birds die in large numbers from air pollution; and, obviously, on the land, where the habitats of many large mammals have been destroyed almost beyond repair. Addressing these large problems requires dedicated work and effort. But it also requires a good normative theory to direct our efforts. Martha C. Nussbaum is Ernst Freund Distinguished Service Professor of Law and Ethics, University of Chicago. She was awarded the 2021 Holberg Prize for her groundbreaking contributions to philosophy, law and related fields. See our website: holbergprize.org for more information and a full video version of the lecture.