160 documentation about origin as well as treatment during use phases makes this step particularly difficult. The Mehr.WERT.Pavillon by KIT Karlsruhe and the office 2hs, located on the premises of the 2019 Federal Garden Show in Heilbronn, aims to prove that the urban mine provides high-quality material resources for structural applications. Next to recycled glass, plastics, and mineral demolition waste, the pavilion’s structure is made from reused steel that was reclaimed from a disused coal power plant near Dortmund. In addition to a detailed visual inspection to determine possible damage to the elements, the steel was tested at KIT laboratories for tensile strength, elasticity, notched bar impact strength, and chemical composition—enabling the reuse of this sixty-year-old steel in a structural application. This example clearly demonstrates the feasibility of circular construction, and it also highlights the important steps that still need to be made in terms of material quality, selection, and documentation. 1 “Global Material Extraction by Material Category, 1980–2013,” materialflows.net , http://www .materialflows.net/materialflowsnet/trends /analyses-1980-2013/global-material-extraction -by-material-category-1980-2013/ (accessed January 7, 2018). 2 Ellen MacArthur Foundation, Towards the Circular Economy 1: Economic and Business Rationale for an Accelerated Transition (Cowes, Isle of Wight: Ellen MacArthur Foundation, 2012). 3 Peter Lacy and Jacob Rutqvist, Waste to Wealth (New York: Palgrave Macmillan, 2015). 4 Ellen MacArthur Foundation, Towards the Circular Economy: Business Rationale for an Accelerated Transition (London: Ellen MacArthur Foundation, 2015). 5 Walter R. Stahel, “Product-Life Factor,” paper presented at “The Future and the Private Sector,” The Woodlands, TX, 1982. 6 European Parliament and the Council, On Waste and Repealing Certain Directives 2008/98/EC (Brussels: European Parliament and the Council, 2008). 7 European Commission, Guidance on the Interpretation of Key Provisions of Directive 2008/98/EC on Waste (Brussels, 2012). 8 Felix Heisel, Dirk E. Hebel, and Werner Sobek, “Resource-Respectful Construction: The Case of the Urban Mining and Recycling unit (UMAR),” lecture at “SBE19 Brussels IOP Conference Series: Earth and Environmental Science,” Brussels, February 5–7, 2019. 9 Walter R. Stahel, The Performance Economy , 2nd ed. (London: Palgrave Macmillan, 2010). 10 Walter R. Stahel, Circular Economy for Beginners (Geneva: Product-Life Institute, 2018).