any agreement to limit anthropogenic emissions has the desired outcome.
This report examines methods used to estimate greenhouse gas emissions and identifies enhancements or new techniques that could be used to significantly improve emissions estimates over the next few years. Chapter 2 describes the national greenhouse gas inventories reported under the UNFCCC and their limitations. The chapter focuses on the accuracy of estimates for the gases and activities in the sectors responsible for most of the emissions: energy and agriculture, forestry, and other land use. The primary gases in these two sectors are CO2, CH4, and N2O. Corresponding estimates for gases and activities in the industrial processes and waste sectors are summarized in Appendix A. The primary gases in these sectors are CO2, CH4, N2O, and HFCs. Chapter 3 describes remote sensing measurements of land use that could provide independent estimates of deforestation and some types of agricultural production. It also describes observations and research needed to improve UNFCCC inventories of emissions from agriculture, forestry, and other land use. Chapter 4 examines atmospheric-based estimates of greenhouse gas emissions, which could provide independent checks on emissions from fossil-fuel use and industrial processes. Additional information on sources of atmospheric and oceanic data, methods for estimating atmospheric signals, and technologies for measuring emissions from large local sources appears in Appendixes B, C, and D, respectively. Biographical sketches of committee members appear in Appendix E, and a list of acronyms and abbreviations is given in Appendix F.