By Alphotographic / Getty Images From fertilizer to bioethanol or even cattle feed, there are already ways to upcycle the leftover grape residues from the production of champagne, known in the business as the ‘aignes’. But a new way to potentially reduce the carbon footprint of champagne production — while also reducing that of the building sector — is now being proposed. From fertilizer to bioethanol or even cattle feed, there are already ways to upcycle the leftover grape residues from the production of champagne, known in the business as the ‘aignes’. But a new way to potentially reduce t…