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. 2012 Dec 19;7(12):e51145. doi: 10.1371/journal.pone.0051145

Table 1. Resource use per year and environmental impact.

Resource Turnover/Year GWP EU LU
kg CO2-eq MJ m2
Carrots (kg) 260000 0.12 1.38 0.16
Mixed grains (kg) 182000 0.51 4.79 1.39
Egg trays (kg) 262 0.98 13.70 0.10
Gas (MJ) 811200 0.07 1.20 0.00
Electricity (MJ) 187200 0.20 3.17 0.00
Water (M3) 211 0.32 5.55 0.04
Animal (kg) 83200 0.01 0.00 0.00
Farm 1 0 0.00 588

Global warming potential (GWP), energy use (EU) and land use (LU) are expressed per unit of input based on economic allocation.