The chapters in this collection explain the role of transboundary environmental impact assessment in international and European law, and explore the relationship between international and European law in the context of potential application of the Convention. They also examine examples of the Convention in practice, and consider the potential application of the Protocol. While the focus of the book is on the situation in the European Union, reference is made to the relationship between EU and non-EU member states, notably in connection with important cases in the Arctic, the Danube Delta and the Baltic Sea.