The Spanish dairy sector has also been the subject of various life cycle analyses. See for example Hospido A, Moreira M T, Feigoo G. Simplified life cycle assessment of Galician milk production. International Dairy Journal 13 (2003) 783–796.
The study looks at both the production (ie. livestock rearing) and at the milk processing stages and finds that 80% of the global warming potential is accounted for by the production stage. It also notes that the methane produced by the cows contributes 30% of the total GHG emissions.
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