The aim of paper is a comparative analysis of on-farm greenhouse gas emissions across family farm types and farm size classes using FADN data in Lithuania. To achieve this, Lithuanian FADN data of 2014 were used for the analysis. The research draws on a sample of 1304 family farms. The methodology is based on an adaptation of the IPCC guidelines using Lithuanian emission factors from Lithuania’s National Inventory Report and the activity data of family farms derived from Lithuanian FADN. The GHG emissions were analysed per farm (t CO2eq farmE-1) and per hectare (CO2eq haE-1 of UAA). The research found out that the major sources of GHG emissions are related to the use of chemical fertilizers on farms comprising 52.6% of the total emissions from family farms. The performed analysis shows that GHG emissions per farm depended on the farm size and ranged from 63.3 t CO2eq farmE-1 to 479.6 t CO2eq farmE-1, on farm size class less than 30 ha UAA and from 500 ha UAA or over, respectively. The GHG emissions on family farms totalled 184.2 t CO2eq farmE-1 and ranged from 5.8 t CO2eq farm E-1 to 234.6 t CO2eq farmE-1, in the permanent crops farms and in the specialist dairying farms, respectively.

The economic situation of Lithuanian agricultural sector faces with challenges in regards to family farms’ income instability and income discrepancies between family farms. The aim of this paper is to assess the economic sustainability of Lithuanian sector at farm level across farm size classes in terms of physical size and by specialization. Furthermore, as the sustainability construction index method was employed as basis to conduct the research, the methodology aspects related to the number of indicators included in the set of indicators and the estimation of thresholds of sustainability intervals were empirically analysed. The findings of economic sub-index assessment indicates very good level of Lithuanian family farms as 68% of the sample farms were defined by medium level of economic sustainability. The assessment of family farms’ economic sustainability by specialization revealed that the horticulture farms performed the highest economic sustainability and, at the other end of spectrum, the COP farms achieved the lowest economic sustainability. As regards the physical size of farms, the best economic sustainability was observed on the smallest farms in terms of size and on the largest farms, of less than 5 ha and from 500 ha or over, respectively.