## 1 Introduction  
The world G20 leaders' summit in Rome and the UN COP26 conference in Glasgow endorsed zero carbon emissions by mid-century for limiting global warming to 1.5 \({}^{\circ}\)C is considered the last chance to rescue the planet. A big number of diesel engines, fuel-energy demand and global warming encourage scientists to search for renewable and locally available biofuels. The US Departments of Energy (USDOE) and Agriculture (USDA) define sustainable biofuels as those that are \"economically competitive, conserve the natural resource base, and ensure social well-being\" [1]. Diesel engines fueled with vegetable oils can reduce CO\({}_{2}\) emissions by nearly 60% in a global cycle to prevent climate change through the decarbonization of agricultural and transport sectors. Pure rapeseed (canola) oil as a diesel fuel substitute has the potential to reduce production and transportation expenditures even more significantly with the elimination of air/water pollution because the esterification facilities and biodiesel washing and drying at the temperature of about 105 \({}^{\circ}\)C are no longer needed to remove residual methanol and glycerol before transferring for end-use or distribution [1]. As stated at the 30 th European Biomass Conference EUBCE 2022, sustainable biomass is the indisputable leading renewable energy source for the global consumer to play a critical role in the decarbonization process of the world economy. A green energy strategy focused on the use of vegetable oils in remote farms, peninsulas, and ecologically sensitive regions suggests a huge economic potential for local agricultural enterprises due to the decentralization of the fuel supply chain. Vegetable oil is especially of interest to farmers because it can be extracted from harvested crops almost for free during on-farm production of oilseed cakes for animal breeding. Using crude oil in a diesel engine reducesproduction costs, energy losses for transportation and ambient air pollution. Additionally, it is important to stress that the energy used for biomass production, conversion, and utilization should be less than the energy content of the final product [1]. As a cheap, locally available, totally renewable, safe to handle and store, environmentally friendly owing to low sulfur and aromatic content fuel-energy source, pure rapeseed oil traditionally has been most popular among other vegetable oils and, therefore, can be regarded as a potential diesel fuel substitute. Directive (EU) 2018/2001 of the European Parliament and of the Council of 11 December 2018 on the promotion of the use of energy from renewable sources tolerates greater flexibility for the Member States to meet their greenhouse gas reduction targets in the most cost-effective manner following their specific circumstances, energy mix and capacity to produce renewable energy. A diverse array of vegetable oils extracted from domestically grown crops, especially rapeseed and soybean, can be used for diesel engine fuelling. The use of locally produced pure rapeseed oil (RO) that complies with the fuel standard DIN 51605:2020-11 [2] is the cheapest way to reduce carbon dioxide (CO\({}_{2}\)) emissions in a global cycle and contribute to protecting the climate. [PERSON] et al. [3] performed a life cycle assessment (LCA) of rapeseed produced in Latvia to update the LCA model based on an up-to-date agricultural practice in Northern Europe. They found that total greenhouse gas (GHG) emissions are 1268 kg CO\({}_{2}\) eq./t to produce spring rapeseed and 1064 kg CO\({}_{2}\) eq./t for winter rape. Whereas total GHG emissions from rapeseed cultivation to processing vary within the range of 203.7-354.7 kg CO\({}_{2}\) eq./t in Slovenia to 828.5-5904.2 kg CO\({}_{2}\) eq./t in Italy. It depends on the vegetable type, life cycle inventory methods and other factors. Nevertheless, rapeseed contains a high oil ratio of 37-50% [4], therefore, its use in diesel engines is economically feasible and can contribute to reducing CO\({}_{2}\) emissions in a global cycle.