This book develops a philosophical framework for democratic world law by drawing on the scientific revolutions of the twentieth century, the history of philosophy of law, and contemporary discussions of law, democracy, and human rights. It examines the legitimacy of the dominant institutions in the contemporary world (monopoly capitalism and the nation-state system) and points beyond these destructive, fragmenting institutions to a holistic approach for human affairs. It concludes by developing the parameters and the likely consequences of a conversion to democratic world law for protecting the environment and human rights as well as creating a world system of peace and prosperity for everyone on Earth.