The aim of this study was to analyze various Austrian dairy production systems (PS) concerning their greenhouse gas emissions (GHGE) in a life-cycle chain, including effects of land-use change (LUC). Models of eight PS that differ, on the one hand, in their regional location (alpine, uplands and lowlands) and, on the other hand, in their production method (conventional versus organic, including traditional and recently emerging pasture-based dairy farming) were designed.In general, the GHGE-reducing effect of a higher milk yield per cow and year in conventional dairy farming cannot compensate for the advantages of organic dairy production which requires lower inputs. This is shown both for GHGE per kg of milk and GHGE per ha and year of farmland. Especially when (imported) concentrates were fed, which had been grown on former forests or grassland, e.g. soybean meal and rapeseed cake, GHGE of conventional dairy farming rose due to the effects of LUC.GHGE per kg milk varied from 0.90 to 1.17 kg CO2-eq for conventional PS, while organic PS on average emitted 11% less greenhouse gases (GHGs), the values ranging from 0.81 to 1.02 CO2-eq per kg milk. Within each production method, PS with a higher milk output generally showed better results for GHGE per kg of milk produced than PS with a lower milk output. Nevertheless the latter showed clearly better results for GHGE per ha of land used, ranging from 5.2 to 7.6 Mg CO2-eq per ha and year for conventional PS and from 4.2 to 6.2 Mg CO2-eq per ha and year for organic PS. The results of this study emphasize the importance of a complete life-cycle assessment in the evaluation of impacts that dairy PS have on the climate.

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In the last decades farm animals kept in confined and mechanically ventilated livestock buildings are increasingly confronted with heat stress (HS) due to global warming. These adverse conditions cause a depression of animal health and welfare and a reduction of the performance up to an increase of the mortality. To facilitate sound management decisions, livestock farmers need relevant arguments, which quantify the expected economic risk and the corresponding uncertainty. The economic risk was determined for the pig fattening sector based on the probability of HS and the calculated decrease in the gross margin. The model calculation for confined livestock buildings showed, that HS indices calculated by easily available meteorological parameters can be used for assessment quantification of indoor HS, which is so far difficult to determine. These weather-related HS indices can be applied not only for an economic risk assessment but also for a weather-index based insurance for livestock farms. Based on the temporal trend between 1981 and 2017, a simple model was derived to assess the likelihood of HS for 2020 and 2030. Due to global warming, the return period for a 90-percentile HS index is reduced from 10 years in 2020 to 3-4 years in 2030. The economic impact of HS on livestock farms was calculated by the relationship between an HS index based on the temperature-humidity index (THI) and the reduction of the gross margin. From the likelihood of the HS and this economic impact function, the probability of the economic risk could be determined. The reduction of the gross margin for a 10 year return period was determined for 1980 with 0.27 € per year and animal place and increased by the 20-fold to 5.13 € per year and animal place in 2030.

Organic farmers throughout Austria were asked in 1999 if, once the first agri-environmental program (Ö PUL) ends, they intended to commit themselves to a further five-year period of organic farming. The study presented here addresses those farmers who expressed in the survey the intention to end their participation in organic farming under Ö PUL, or who were undecided at that time. The aim was to compare and analyze the intended behavior with actual behavior. The research was based on material from, and analyses of, the 1999 survey and the survey conducted in 2002. Additional information regarding the reasons for abandoning (or continuing) organic farming and the decision-making process itself was collected through a series of telephone interviews in 2004. The comparison revealed a connection between actual behavior and the intentions expressed in the 1999 survey. However, there were no clear differences in terms of the reasons given in 1999 for potentially discontinuing with organic farming between those farms that remained organic and those that reverted to conventional farming methods. There were differences between those reasons given in the 1999 survey for potentially leaving organic agriculture and the reasons that determined the actual decision, as cited in telephone interviews in 2004. In the 1999 survey, economic issues were the main reasons for potentially ceasing to farm organically. When it came to the actual decision, problems concerning organic guidelines and inspections were more prominent. The environmental attitudes and the social embedding of the farmers within organic agriculture played a decisive role on those enterprises that chose to continue farming organically. The analysis indicates that the presence of a successor is also a stabilizing factor for organic farming.