- The document discusses life cycle assessment (LCA), a method to quantify the environmental impacts of products across their entire lifecycle from raw material extraction to end of life. - Key aspects of LCA include defining system boundaries, data sources, allocation methods, and standards like ISO 14040. LCA can be used as a design tool and verification method. - For buildings, the Environmental Performance of Buildings (MPG) is a metric of sustainability, with lower scores indicating more sustainable material use. Factors with largest impacts include facades, floors, and installations. LCA data of materials is available in the national environmental database.