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The purpose of this paper is to empirically identify key factors of UK food supply chains (SCs) that significantly contribute to CO₂ emissions (CO2e) taking into account the life cycle assessment (LCA). The UK food supply chain includes imports from other countries.

This research develops a conceptual framework from extant literature. Secondary data obtained from ONS and FAOSTAT covering from 1990 to 2014 are analysed using Multilinear Regression (MLR) and Stochastic Frontier Analysis (SFA) to identify the factors relating to CO₂ emissions significance, and the efficient contributions that are being made to their reduction in the UK food supply chains.

The study results suggest that Transportation and Sales/Distribution are the two key factors of CO₂ emissions in UK food supply chains. This is confirmed by two multivariate methods, MLR and SFA. MLR results show that transportation increases UK CO₂ emissions by 10 tonnes of CO₂ emissions from one tonne of fruits and vegetables imports from overseas to the UK Sales and Distribution reduces the UK CO₂ emissions by 1.3 tonnes of CO₂ emissions due to improved, technological operation activities in the UK. In addition, the SFA results confirm that the key factors are sufficient to predict an increase or decrease in CO₂ emissions in the UK food supply chains.

This study has focused on the LCA of the UK food supply chain from limited data. Future studies should consider Sustainability Impact Assessment of the UK food supply chain, identifying the social, economic, regulatory and environmental impacts of the food supply chain using a re-defined LCA (all-inclusive assessment) tool.

This research suggests that food supply chain professionals should improve efficiency, e.g. the use of solar energy and biogas, and also integrate low-carbon policies and practices in food supply chain operations. Furthermore, governments should encourage policies such as mobility management programmes, urban redevelopment and privatisation to enhance better transportation systems and infrastructure to continuously reduce CO₂e from the food trade.

Although logistics play a major role in CO₂ emissions, all logistics CO₂ emissions for other countries are not included in the ONS data. This research reveals some important insights into the UK food supply chains. Logistics and other food supply chain processes of importing countries significantly contribute to CO₂ emissions which are yet to be considered in the UK food SCs.