The realisation of justice in the real world requires political theory and political action. This book offers a road map for these two notions to connect. It explains how action-guiding principles are formulated by seeking cross-disciplinary input. Also, it casts light on the concepts that occupy the space between political theory and real-world politics, which are often used as reasons to obstruct the progression of social justice, e.g. feasibility, fact-sensitivity, compliance and path-dependence. This book argues for a re-appropriation of these concepts in the name of justice. Many examples will be provided. In particular, the book focuses on the case of climate change. It offers two case studies on the realisation of climate justice.