The paper presents a method for assessing the economic impact of on-farm application of technology that causes reduction in greenhouse gasses emission. The proposed method takes into account the incomplete depreciation of technical means used under conditions of crop and animal production technologies applied to date. The scope of its application, in the form presented in the paper, is confined to the farm scale. The use in the scale of the whole agriculture would require, on the one hand, omission of technologies applied to date, and on the other hand – taking into account the emission transfer between national economy sectors and the ones resulting from foreign trade.