![]() ![]() Consequently, high GHG mitigation expectations have been put on the increased energy efficiency of both the newer and especially the future building stock.Ĭonstruction phase GHGs, or the embodied pre-use phase emissions, have sometimes not been considered very important over the building life cycle since their contribution to the whole life-cycle emissions has been considered minor. While fossil fuel combustion is the key emissions source, the building sector is one of the main indirectly responsible sectors, with a share of roughly 20% of the global anthropogenic GHG emissions, mainly due to heating and electricity use in buildings. The same GHG emissions are also leading to ecosystem-threatening acidification of water resources, particularly oceans. ), as is the consensus that humans are the cause. The existence of climate change, caused by greenhouse gas (GHG) emissions, is becoming more and more evident (e.g. The results fall in midway between the extremes published using the two methods but still deviate from each other by a multiplier of almost 2. The implications of acknowledging this are discussed. The results depict how the two main LCA methods produce significantly different results. Exactly the same scope is utilized in order to maximize comparability. This study takes a step toward filling this gap by presenting a comparison of process and IO LCA results of the pre-use phase of a residential concrete element building in Finland. It is thus questionable whether LCA can provide data that can be used for decision-making and policy formation. When looking at the scale of published LCA results, it is evident that IO LCAs are placed at the top end, and process LCAs at the bottom end. ![]() However, within LCA there are two very different approaches – process LCA and input–output (IO) LCA – which lead to different results. Life-cycle assessment (LCA) is arguably the best method to assess and analyze the emissions caused by buildings. Use phase has traditionally been the focus area, but the importance of construction-phase has increased with the emergence of energy-efficient buildings. ![]() Buildings are a major contributor to climate change. ![]()
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