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Eggs are a valuable source of protein, with one egg corresponding to more than 10% of the daily recommended intake of protein . In Europe and the USA, the average consumption of eggs is 10-15 kg per person, corresponding to 150-250 eggs .
Feed (wheat 60-70%, soy 10-20% and seeds) represents the majority of the GHG emissions, ranging from 50-75% . To produce one kg of eggs, around 2 kg of feed are needed . One hen typically produces around 20 kg of eggs .
 How much protein do you need every day? (created June 21 2019; accessed September 27 2021) https://www.health.harvard.edu/blog/how-much-protein-do-you-need-every-day-201506188096
 Per capita egg consumption, 2017. Our world in data https://ourworldindata.org/grapher/per-capita-egg-consumption-kilograms-per-year
 Taylor, R. C., Omed, H., & Edwards-Jones, G. (2014). The greenhouse emissions footprint of free-range eggs. Poultry science, 93(1), 231-237.
 Cederberg, C. (2009). Greenhouse gas emissions from Swedish production of meat, milk and eggs 1990 and 2005. SIK Institutet för livsmedel och bioteknik.