This book is a statistical framework that provides a comprehensive, consistent, comparable and flexible set of environmental-economic accounts for policy making, analysis and research purposes. Agenda 21 adopted at the 1992 United Nations Conference on Environment and Development held in Rio de Janeiro, Brazil called for the establishment of a “program to develop national systems of integrated environmental and economic accounting in all countries”. More recently, the outcome document of the Rio 20 Conference reconfirmed that “integrated social, economic, and environmental data and information…is important to decision-making processes.” In response to the continued need for environmental and environmental-economic information, the United Nations Statistical Commission established the UN Committee of Experts on Environmental-Economic Accounting (UNCEEA), an intergovernmental body composed of representatives from national statistical offices and international agencies, with the mandate to revise the SEEA.