The article deals with the problem of climate change. The aim of the study is to analyze and improve methodological recommendations for calculating greenhouse gas emissions. The urgency of reducing the volume of greenhouse gas emissions has been substantiated. Statistical data of emissions volumes are analyzed, the reason for the growth of emissions and the main contributors are determined. The main gases that give the greenhouse effect are identified, and their brief characteristics are given. The need to improve the monitoring and reporting system of greenhouse gas emissions at the global level has been substantiated. The goal of a perfect system for accounting and reporting of greenhouse gas emissions is to timely obtain relevant data for the systematic reduction of greenhouse gas emissions. The methodological tools for quantifying greenhouse gas emissions, approved by the Ministry of Natural Resources and Environment of Russia, are analyzed from the point of view of their applicability by organizations. Measures for their improvement are proposed, based on the international experience of building guidelines for the IPCC greenhouse gas inventory. The results obtained may be of interest to energy companies when developing corporate guidelines for quantifying greenhouse gas emissions.