Gillian Brock develops a viable cosmopolitan model of global justice that takes seriously the equal moral worth of persons, yet leaves scope for defensible forms of nationalism and for other legitimate identifications and affiliations people have. Brock addresses two prominent kinds of skeptic about global justice: those who doubt its feasibility and those who believe that cosmopolitanism interferes illegitimately with the defensible scope of nationalism by undermining goods of national importance, such as authentic democracy or national self-determination. The model addresses concerns about implementation in the world, showing how we can move from theory to public policy that makes progress toward global justice. It also makes clear how legitimate forms of nationalism are compatible with commitments to global justice.

Global Justice is divided into three central parts. In the first, Brock defends a cosmopolitan model of global justice. In the second, which is largely concerned with public policy issues, she argues that there is much we can and should do toward achieving global justice. She addresses several pressing problems, discussing both theoretical and public policy issues involved with each. These include tackling global poverty, taxation reform, protection of basic liberties, humanitarian intervention, immigration, and problems associated with global economic arrangements. In the third part, she shows how the discussion of public policy issues can usefully inform our theorizing; in particular, it assists our thinking about the place of nationalism and equality in an account of global justice.