The Monograph presents the results of research conducted in the first year of activity of the research network “Reduction of greenhouse gases and ammonia in agriculture” – AGROGAS. The experiments were conducted at the field level, where two soil tillage systems were applied – the conventional and the reduced, at the farm level, with three systems of plant production – ecological, conventional and integrated, and at the level of a region, where estimations were made of the levels of emission of methane and nitric oxide (I). Also, studies were conducted on the applicability of methods for the reduction of ammonia and greenhouse gases generated in farm animal breeding. The results indicate that the applied systems of soil tillage caused significant changes in the examined physical, chemical and microbiological properties of the soils. Reduced tillage caused an increase in soil compaction and moisture, as well as an increase in the content of potassium, especially in the top horizon of the soil. Also, the growth and vegetation of plants in the reduced tillage system were characterized by different runs than in the conventional tillage system. Poorer nutrition of plants with nitrogen (lower leaf green index) and lower dry mass of plants were observed there. The reduced tillage system was also conducive to the creation of soil environment conditions that were more friendly for the growth and development of soil micro-organisms, as compared to the conventional system. The study also showed an effect of the tillage system applied on the concentration of carbon dioxide in the soil profile. Higher carbon dioxide concentration was observed in the conventional tillage system as opposed to the reduced tillage. Analysis of climatic conditions at the localities where the field experiments were conducted showed that the temperature from October to December, 2006, notably exceeded the mean multi-year values determined from the Model Agroclimate of Poland for the years 2001-2010. Analysis of estimated emissions of methane and nitric oxide (I), performed in accordance to the recommendations of the International Panel for Climate Changes (IPCC), showed notable differentiation between the particular regions. The study demonstrated that carbon sequestration ensured the neutrality of the processes of combustion of energy crop plants (Miscanthus and coppiced willow) with respect to the emission of greenhouse gases to the atmosphere. The Monograph presents also a detail description of test station equipment and methods of experimentation in low-volume balance chambers and in balance chambers with enforced constant air circulation. The obtained results support the effectiveness of the selected solutions aimed at the reduction of emission of gases from farm animal sheds and barns. Analyses performed for the experimental results obtained and presented in the Monograph and of results of studies conducted in subsequent years of the activity of the AGROGAS network will permit identification of methods allowing the reduction of greenhouse gases and ammonia emission in agriculture.