Environmental benchmarks for buildings: needs, challenges and solutions—71st LCA forum, Swiss Federal Institute of Technology, Zürich, 18 June 2019 - Rolf Frischknecht; Maria Balouktsi; Thomas Lützkendorf; Annette Aumann; Harpa Birgisdottir; Elmar Grosse Ruse; Alexander Hollberg; Matti Kuittinen; Monica Lavagna; Antonín Lupišek; Alexander Passer; Bruno Peuportier; et al. (The International Journal of Life Cycle Assessment, 2019)