The book describes of the indicator system of ecological security as the energy security component part (pollutions of the atmosphere, hydrosphere, lithosphere and a set of economic indicators). The book describes of many years experience in estimating greenhouse gas emissions and 25 pollutants for the energy sector under the CLRTAR and UNFCCC; cycles for the preparation of national inventories, difficulties, approaches, innovations, additional research works, quality assurance procedures. The dynamics (1990-2019) of emissions of the main pollutants, heavy metals, persistent organic pollutants, greenhouse gases in the country are presented and briefly described, and a comparison is made with some countries based on a number of specific indicators. The experience of restoring gaps in data series using four methods is described, and examples are provided for specific categories. Some ideas for improving the preparation of information on emissions in the country are proposed and the current difficulties and research perspectives in the assessment of pollutant emissions are briefly described.