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An environmental Life Cycle Assessment (LCA) was performed to compare four typical milk production systems of the Po Valley: drinking milk (A); Parmigiano-Reggiano more intensive (B); Parmigiano-Reggiano less intensive (C) and Grana Padano (D). The input and output data were collected directly from the farmers by way of questionnaires.The results indicated that the total GHG emissions from the analysed...