Embodied emissions of buildings - A forgotten factor in green building certificates

• Published in: Energy and Buildings
• Main Authors: Amiri, Ali, Emami, Nargessadat, Ottelin, Juudit, Sorvari, Jaana, Marteinsson, Björn, Heinonen, Jukka, Junnila, Seppo
• Other Authors: Department of Built Environment, Real Estate, University of Iceland, Finnish Environment Institute, Aalto-yliopisto, Aalto University
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2021
• Subjects: LCA; Life cycle assessment; LEED; Leadership in energy and environmental design; Iceland
• Online Access: https://aaltodoc.aalto.fi/handle/123456789/106932; https://doi.org/10.1016/j.enbuild.2021.110962

Funding Information: This research was funded by the Ministry of the Environment of Finland, CarbonSinkCity grant (310283). The views expressed by the authors do not necessarily reflect those of the funder. Publisher Copyright: © 2021 The Author(s) Copyright: Copyright 2021 Elsevier B.V., All rights reserved. The construction and use of buildings consume a significant proportion of global energy and natural resources. Leadership in Energy and Environmental Design (LEED) is arguably the most international green building certification system and attempts to take actions to limit energy use of buildings and construct them sustainably. While there has been a wide range of research mainly focused on energy use and emission production during the operation phase of LEED-certified buildings, research on embodied emissions is rare. The aim of this study is to evaluate the efficiency of LEED regarding initial (pre-use) embodied emissions using life cycle assessment (LCA). The study comprised several steps using a designed model. In the first step, three optional building material scenarios were defined (optimized concrete, hybrid concrete-wood, and wooden buildings) in addition to the base case concrete building located in Iceland. Second, an LCA was conducted for each scenario. Finally, the number of LEED points and the level of LEED certification was assessed for all studied scenarios. In addition, a comparison regarding embodied emissions consideration between LEED and Building Research Establishment Environmental Assessment Method (BREEAM) as mostly used green certificate was conducted in the discussion section. The LCA showed the lowest environmental impact for the wooden building followed by the hybrid concrete wood building. In the LEED framework, wooden and hybrid scenarios obtained 14 and 8 points that were related to material selection. Among these points, only 3 (out of a total of 110 available points) were directly accredited to embodied emissions. The study recommends that the green building certificates ...