Environmental and economic sustainability is becoming a key factor in the life of people and in politics. Comprehensive legal regulations and ambitious climate goals are indicating new standards in all branches including the waste management sector. The pursuit to a circular economy leads to a holistic view on the product-lifecycle and places a stronger focus on all processes and their CO2 footprint nowadays. This thesis concentrates on organic waste treatment and the related processes with a special emphasis on their climate impact. To perform a life-cycle analysis (LCA) data was obtained from partner companies. Detailed analyses were conducted for biogas and composting treatments. The process and impact of biofuels is presented by data from literature. The comparison of the processes is being discussed considering all legal regulations and potential for improvement. The outcome of the study shows the applicability of the LCA method published by renewable directive for all three processes. However due to different functional units, the comparability is limited. The results show numbers between 0,4 ¿ 25 g CO2 äq. / MJ for biogas treatment, 16 ¿ 35 g CO2 äq. / MJ for biofuels and 107 ¿ 128 kg CO2 äq. / t input for composting treatment. The differences are mainly explained by air emissions, bonuses for emission savings and transport distances. In contrast to the results the processes and products are compared to the fossil alternatives. The results prove the benefits connected to climate effect of the products of biological treatment.