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Due to discussions on climate change, environmental pollution, exhaustible energies and resources ecological efficiency has gained importance as one decisive objective beside economic efficiency. As a concept for sustainability appraisals, life cycle engineering addresses both of the efficiency dimensions basing on two pillars: life cycle assessment (LCA) and life cycle costing (LCC). LCA and LCC are often applied independent from each other and thus, significant relationships between ecological and economic efficiency remain unconsidered. Therefore, the paper investigates mutual points of contact and methodical relationships and presents a procedure model for an integrated use of LCA and LCC.

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