This book is a collective monograph prepared by scientists from Russian Peoples’ Friendship University. The purpose of this book is to show the importance of the codification’s process for development of international environmental law (IEL) and to describe different forms of IEL’s legal sources This monograph has a good structure and consists of 5 chapters. In the first chapter authors analyze key concepts of IEL, such as “codification of International Environmental Law” and “soft law”. The second chapter is dedicated to description of principles of IEL. The roles of international governmental organizations (UN, FAO, IMO, ICAO and IAEA) and nongovernmental organizations (IUCN, WWF, Greenpeace International, ICRC) in process of codification...