The 19th Special Session of the United Nations General Assembly (UNGASS) begins its overall review and appraisal of the implementation of Agenda 21 at UN Headquarters in New York today, five years after the United Nations Conference on Environment and Development (UNCED) in Brazil. Agenda 21 is the Programme of Action for Sustainable Development agreed to at UNCED and endorsed by the General Assembly in its resolution 47/190. In the same resolution the GA decided to convene a special session to review and appraise Agenda 21 implementation. Approximately 60 Heads of State and Government are expected to address the Assembly during the week. Negotiations on the texts to be adopted at the conclusion of UNGASS began at the CSDs Ad Hoc Open-Ended Intersessional Working Group and continued at CSD-5. Further progress was made at informal consultations in New York during the week leading up to UNGASS.