###### Abstract  
Since the supply of basic needs, especially food, is among the strategic priorities of each country and conventional food production methods no longer suffice, food production methods are now transforming into industrial approaches. Industrialization, however, requires higher energy usage. Greater energy demand brings about the issue of energy sustainability. In particular, the depletion of fossil fuels results in serious challenges in food production processes. On the other hand, the utilization of energy carriers is accompanied by environmental contamination. In this regard, evaluating energy consumption and environmental pollution in the production systems can be a proper approach to finding the energy consumption and pollution centers for presenting applicable solutions to decrease pollution. In this study, energy indices of ER, EP, SE, and NEG were assessed to evaluate the energy consumption of lettuce production. The results showed values of 0.4, 17.28 kg/MJ, 0.06 MJ/kg, and 29,922 MG/ha for ER, EP, SE, and NEG, respectively. Among the consumption inputs, diesel fuel and nitrogen fertilizer had the highest consumption rate. Pollutants were also explored by the life cycle assessment method. Accordingly, chemicals and agricultural machinery led to the highest contaminating emissions. To reduce environmental contaminants, lowering the application of chemical pesticides, using biological approaches to combat pests, determining the proper amount of chemical fertilizers, using animal fertilizers, and using the proper agricultural machines should be considered. e 2022  
in energy efficiency can help to reduce the dire environmental consequences; it can promote the goals of sustainable agriculture. Therefore, proper use of energy in agriculture and breeding can result in sustainable production, cost-effectiveness, and slower depletion of fossil fuel sources while preventing air pollution [11]. Management of energy consumption is the only approach to this goal. One of the methods of energy management involves the analysis of energy consumption and the determination of the energy consumption indices [10; 12]. Additionally, determining the emission of environmental pollutants per energy consumption can be an analytical tool to calculate the pollution induced by energy consumption, along with the energy consumption-related analysis [8; 13]. There is a lack of literature on the management of energy consumption in lettuce production; thus, it will be discussed in this research. Environmental indicators, as one of the sustainability criteria in various production and service activities, are of interest to researchers. One of the limitations of considering inputs in the agricultural sector is the release of various pollutants that have negative effects on the environment. Numerous studies on the determination of agricultural energy inputs and outputs and environmental pollution highlight the significance of this issue in agriculture and its subunits regarding agricultural strategies [14]. In the following paragraph, some of these studies are mentioned. [PERSON] [15] evaluated the energy indices of cultivating tobacco under dryland farming in the north of Iran. They obtained a mean yield of 1112 kg/ha, corresponding to an energy input of 890 MJ/ha. The energy efficiency (the ratio of output energy to input energy) was determined as 0.03, indicating the inefficient use of energy in the tobacco production system. The share of nonrenewable energy in the total input energy was 94.09%. They finally concluded that tobacco production requires a modification of the energy consumption and application of renewable energies. [PERSON] et al. [16] addressed the life cycle assessment of different bean varieties in Greece. After evaluation based on product volume (kg), it was established that varieties with higher input requirements have higher yields and less environmental impact. [PERSON] et al. [17] explored the life cycle assessment of lettuce production in Spain and Italy.