The fourth volume of the International Environmental Law Reports collects together approximately fifty decisions of national courts from twenty-six countries, all broadly related to international environmental law. The cases cover a range of environmental issues, from protected species and habitats to activities that impact on the environment - including mining, the construction of dams and waste disposal. The collection evidences different approaches to the relationship between domestic and international legal systems, and highlights many substantive and procedural environmental laws that are enjoying increasing recognition around the world. With around half of the cases having been translated into English from as many as twelve other languages, the volume provides valuable comparative insight into national legal perspectives on international environmental law.