(1) In single feedstock digestion, compounded LCA and life-cycle energy analyses indicated that straw and corn silage were sustainable feedstocks for biogas production, due to their higher energy density compounded with comparatively low environmental impacts associated with feedstock supply logistics and
land use. For example, corn silage achieved up to 6 times lower damages to ecosystem diversity compared to grass silage and whole wheat plant silage. This was mainly influenced by agricultural land occupation impacts, equivalent to 20% and 25% of grass silage and whole wheat plant silage, respectively.