The Twelfth Meeting of the Greater Mekong Subregion (GMS) Working Group on Environment (WGE-12) was held in Bangkok, Thailand on 25-26 April 2006. The Ministry of Natural Resources and Environment (MONRE) of Thailand hosted the meeting in cooperation with the Asian Development Bank (ADB). The participants included delegations from Cambodia, the People's Republic of China (PRC), Lao PDR, Myanmar, Thailand, and Viet Nam. Observers/resource persons from MFLU, IGES, UNCRD, UNEP, SEI, SIDA, USAID, US EPA, The Netherlands Government, MRC, IUCN, WWF, and ADB also attended. The objectives of the WGE-12 meeting were to review the progress of the GMS Core Environment Program (CEP), and discuss its key activities and budget for year 1. The WGE-12 Agenda is attached as Appendix 2. Co-chairing the meeting were Dr. Monthip Sriratana Tabucanon, Deputy Permanent Secretary, MONRE, Mr. Urooj Malik, Director, MKAE, ADB, and Mr. Surendra Shrestha, Regional Director, UNEP (for day 2).