There is mounting evidence that, depending on social and economic circumstances, some communities and groups may face disproportionate exposure to environmental hazards, bear an inequitable share of the costs associated with environmental policies or face more barriers to participating in environmental decision-making. As countries increase their efforts to tackle environmental degradation, pollution and climate change, the concept of environmental justice can shed light on how to ensure fairness in the processes and outcomes of environmental policymaking. This report examines the plurality of the concept of environmental justice, its underlying conceptual pillars and how it has emerged in different contexts around the world. The report also provides the first policy stocktake of how governments across the OECD and beyond are seeking to redress environmental justice concerns, building upon insights from 26 responses to the OECD Environmental Justice Survey as well as complementary desk analysis across a broader set of countries.