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Carbon footprint of Canadian dairy products: Calculations and issues

X.P.C. Vergé, Dominique Maxime, J.A. Dyer, R.L. Desjardins, Y. Arcand and A. Vanderzaag

Article (2013)

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Cite this document: Vergé, X.P.C., Maxime, D., Dyer, J.A., Desjardins, R.L., Arcand, Y. & Vanderzaag, A. (2013). Carbon footprint of Canadian dairy products: Calculations and issues. Journal of Dairy Science, 96(9), p. 6091-6104. doi:10.3168/jds.2013-6563
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The Canadian dairy sector is a major industry with about 1 million cows. This industry emits about 20% of the total greenhouse gas (GHG) emissions from the main livestock sectors (beef, dairy, swine, and poultry). In 2006, the Canadian dairy herd produced about 7.7 Mt of raw milk, resulting in about 4.4 Mt of dairy products (notably 64% fluid milk and 12% cheese). An integrated cradle-to-gate model (field to processing plant) has been developed to estimate the carbon footprint (CF) of 11 Canadian dairy products. The on-farm part of the model is the Unified Livestock Industry and Crop Emissions Estimation System (ULICEES). It considers all GHG emissions associated with livestock production but, for this study, it was run for the dairy sector specifically. Off-farm GHG emissions were estimated using the Canadian Food Carbon Footprint calculator, (cafoo)(2)-milk. It considers GHG emissions from the farm gate to the exit gate of the processing plants. The CF of the raw milk has been found lower in western provinces [0.93 kg of CO2 equivalents (CO(2)e)/L of milk] than in eastern provinces (1.12 kg of CO(2)e/L of milk) because of differences in climate conditions and dairy herd management. Most of the CF estimates of dairy products ranged between 1 and 3 kg of CO(2)e/kg of product. Three products were, however, significantly higher: cheese (5.3 kg of CO(2)e/kg), butter (7.3 kg of CO(2)e/kg), and milk powder (10.1 kg of CO(2)e/kg). The CF results depend on the milk volume needed, the co-product allocation process (based on milk solids content), and the amount of energy used to manufacture each product. The GHG emissions per kilogram of protein ranged from 13 to 40 kg of CO(2)e. Two products had higher values: cream and sour cream, at 83 and 78 kg of CO(2)e/kg, respectively. Finally, the highest CF value was for butter, at about 730 kg of CO(2)e/kg. This extremely high value is due to the fact that the intensity indicator per kilogram of product is high and that butter is almost exclusively fat. Protein content is often used to compare the CF of products; however, this study demonstrates that the use of a common food component is not suitable as a comparison unit in some cases. Functionality has to be considered too, but it might be insufficient for food product labeling because different reporting units (adapted to a specific food product) will be used, and the resulting confusion could lead consumers to lose confidence in such labeling. Therefore, simple units might not be ideal and a more comprehensive approach will likely have to be developed.

Uncontrolled Keywords

dairy herds; greenhouse gases; cheeses; sour cream; livestock and meat industry; beef; manufacturing; dairy herd management; raw milk; energy; co-product allocation; carbon dioxide; models; poultry; butter; fluid milk; cows; milk; livestock production; materials life cycle; greenhouse gas emissions; climate; swine; product labeling; carbon footprint; protein content; dried milk; farms ; carbon footprint ; modeling

Open Access document in PolyPublie
Subjects: 1200 Génie rural > 1202 Gestion des déchets agricoles
1500 Génie de l'environnement > 1500 Génie de l'environnement
1500 Génie de l'environnement > 1503 Pollution de l'air et pollution par le bruit
Department: Département de génie chimique
Research Center: CIRAIG - Centre international de référence sur le cycle de vie des produits, procédés et services
Date Deposited: 05 Dec 2018 16:12
Last Modified: 08 Apr 2021 10:43
PolyPublie URL: https://publications.polymtl.ca/3424/
Document issued by the official publisher
Journal Title: Journal of Dairy Science (vol. 96, no. 9)
Publisher: Elsevier
Official URL: https://doi.org/10.3168/jds.2013-6563


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