A scenario analysis of the life cycle greenhouse gas emissions of a new residential area

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A scenario analysis of the life cycle greenhouse gas emissions of a new residential area. / Säynäjoki, Antti; Heinonen, Jukka; Junnila, Seppo.

In: Environmental Research Letters, Vol. 7, No. 3, 034037, 2012, p. 1-10.

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@article{0df12049eb7c46a48041851f10703c46,
title = "A scenario analysis of the life cycle greenhouse gas emissions of a new residential area",
abstract = "While buildings are often credited as accounting for some 40{\%} of the global greenhouse gas (GHG) emissions, the construction phase is typically assumed to account for only around one tenth of the overall emissions. However, the relative importance of construction phase emissions is quickly increasing as the energy efficiency of buildings increases. In addition, the significance of construction may actually be much higher when the temporal perspective of the emissions is taken into account. The construction phase carbon spike, i.e. high GHG emissions in a short time associated with the beginning of the building's life cycle, may be high enough to question whether new construction, no matter how energy efficient the buildings are, can contribute to reaching the greenhouse gas mitigation goals of the near future. Furthermore, the construction of energy efficient buildings causes more GHG emissions than the construction of conventional buildings. On the other hand, renovating the current building stock together with making energy efficiency improvements might lead to a smaller construction phase carbon spike and still to the same reduced energy consumption in the use phase as the new energy efficient buildings. The study uses a new residential development project in Northern Europe to assess the overall life cycle GHG emissions of a new residential area and to evaluate the influence of including the temporal allocation of the life cycle GHG emissions in the assessment. In the study, buildings with different energy efficiency levels are compared with a similar hypothetical area of buildings of the average existing building stock, as well as with a renovation of an area with average buildings from the 1960s. The GHG emissions are modeled with a hybrid life cycle assessment. The study suggests that the carbon payback time of constructing new residential areas is several decades long even when using very energy efficient buildings compared to utilizing the current building stock. Thus, while increasing the overall energy efficiency is important in the long term, the construction of new energy efficient buildings cannot be used as a means to achieve the short term and medium term climate change mitigation goals as cities and governments often suggest. Furthermore, given the magnitude of the carbon spike from construction and its implications, the climate change mitigation strategies should set reduction targets for the construction phase emissions alongside the ones for the use phase, which currently receives almost all of the attention from policy-makers.",
keywords = "carbon spike, construction, GHG, greenhouse gas, life cycle assessment, Real Estate Business, REB, residential development, carbon spike, construction, GHG, greenhouse gas, life cycle assessment, Real Estate Business, REB, residential development, carbon spike, construction, GHG, greenhouse gas, life cycle assessment, Real Estate Business, REB, residential development",
author = "Antti S{\"a}yn{\"a}joki and Jukka Heinonen and Seppo Junnila",
year = "2012",
doi = "10.1088/1748-9326/7/3/034037",
language = "English",
volume = "7",
pages = "1--10",
journal = "Environmental Research Letters",
issn = "1748-9326",
publisher = "IOP Publishing",
number = "3",

}

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TY - JOUR

T1 - A scenario analysis of the life cycle greenhouse gas emissions of a new residential area

AU - Säynäjoki, Antti

AU - Heinonen, Jukka

AU - Junnila, Seppo

PY - 2012

Y1 - 2012

N2 - While buildings are often credited as accounting for some 40% of the global greenhouse gas (GHG) emissions, the construction phase is typically assumed to account for only around one tenth of the overall emissions. However, the relative importance of construction phase emissions is quickly increasing as the energy efficiency of buildings increases. In addition, the significance of construction may actually be much higher when the temporal perspective of the emissions is taken into account. The construction phase carbon spike, i.e. high GHG emissions in a short time associated with the beginning of the building's life cycle, may be high enough to question whether new construction, no matter how energy efficient the buildings are, can contribute to reaching the greenhouse gas mitigation goals of the near future. Furthermore, the construction of energy efficient buildings causes more GHG emissions than the construction of conventional buildings. On the other hand, renovating the current building stock together with making energy efficiency improvements might lead to a smaller construction phase carbon spike and still to the same reduced energy consumption in the use phase as the new energy efficient buildings. The study uses a new residential development project in Northern Europe to assess the overall life cycle GHG emissions of a new residential area and to evaluate the influence of including the temporal allocation of the life cycle GHG emissions in the assessment. In the study, buildings with different energy efficiency levels are compared with a similar hypothetical area of buildings of the average existing building stock, as well as with a renovation of an area with average buildings from the 1960s. The GHG emissions are modeled with a hybrid life cycle assessment. The study suggests that the carbon payback time of constructing new residential areas is several decades long even when using very energy efficient buildings compared to utilizing the current building stock. Thus, while increasing the overall energy efficiency is important in the long term, the construction of new energy efficient buildings cannot be used as a means to achieve the short term and medium term climate change mitigation goals as cities and governments often suggest. Furthermore, given the magnitude of the carbon spike from construction and its implications, the climate change mitigation strategies should set reduction targets for the construction phase emissions alongside the ones for the use phase, which currently receives almost all of the attention from policy-makers.

AB - While buildings are often credited as accounting for some 40% of the global greenhouse gas (GHG) emissions, the construction phase is typically assumed to account for only around one tenth of the overall emissions. However, the relative importance of construction phase emissions is quickly increasing as the energy efficiency of buildings increases. In addition, the significance of construction may actually be much higher when the temporal perspective of the emissions is taken into account. The construction phase carbon spike, i.e. high GHG emissions in a short time associated with the beginning of the building's life cycle, may be high enough to question whether new construction, no matter how energy efficient the buildings are, can contribute to reaching the greenhouse gas mitigation goals of the near future. Furthermore, the construction of energy efficient buildings causes more GHG emissions than the construction of conventional buildings. On the other hand, renovating the current building stock together with making energy efficiency improvements might lead to a smaller construction phase carbon spike and still to the same reduced energy consumption in the use phase as the new energy efficient buildings. The study uses a new residential development project in Northern Europe to assess the overall life cycle GHG emissions of a new residential area and to evaluate the influence of including the temporal allocation of the life cycle GHG emissions in the assessment. In the study, buildings with different energy efficiency levels are compared with a similar hypothetical area of buildings of the average existing building stock, as well as with a renovation of an area with average buildings from the 1960s. The GHG emissions are modeled with a hybrid life cycle assessment. The study suggests that the carbon payback time of constructing new residential areas is several decades long even when using very energy efficient buildings compared to utilizing the current building stock. Thus, while increasing the overall energy efficiency is important in the long term, the construction of new energy efficient buildings cannot be used as a means to achieve the short term and medium term climate change mitigation goals as cities and governments often suggest. Furthermore, given the magnitude of the carbon spike from construction and its implications, the climate change mitigation strategies should set reduction targets for the construction phase emissions alongside the ones for the use phase, which currently receives almost all of the attention from policy-makers.

KW - carbon spike

KW - construction

KW - GHG

KW - greenhouse gas

KW - life cycle assessment

KW - Real Estate Business

KW - REB

KW - residential development

KW - carbon spike

KW - construction

KW - GHG

KW - greenhouse gas

KW - life cycle assessment

KW - Real Estate Business

KW - REB

KW - residential development

KW - carbon spike

KW - construction

KW - GHG

KW - greenhouse gas

KW - life cycle assessment

KW - Real Estate Business

KW - REB

KW - residential development

UR - http://iopscience.iop.org/1748-9326/7/3/034037

U2 - 10.1088/1748-9326/7/3/034037

DO - 10.1088/1748-9326/7/3/034037

M3 - Article

VL - 7

SP - 1

EP - 10

JO - Environmental Research Letters

JF - Environmental Research Letters

SN - 1748-9326

IS - 3

M1 - 034037

ER -

ID: 794899