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CO 2 Payoff of Extensive Green Roofs with Different Vegetation Species

Author

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  • Takanori Kuronuma

    (Center for Environment, Health and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan)

  • Hitoshi Watanabe

    (Center for Environment, Health and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan)

  • Tatsuaki Ishihara

    (Kyodo KY-Tec Corporation, 1-15-1, Ebisu-minami, Shibuya-ku, Tokyo 150-0022, Japan)

  • Daitoku Kou

    (Kyodo KY-Tec Corporation, 1-15-1, Ebisu-minami, Shibuya-ku, Tokyo 150-0022, Japan)

  • Kazunari Toushima

    (Kyodo KY-Tec Corporation, 1-15-1, Ebisu-minami, Shibuya-ku, Tokyo 150-0022, Japan)

  • Masaya Ando

    (Center for Environment, Health and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan)

  • Satoshi Shindo

    (Center for Environment, Health and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan)

Abstract

Green roofs are considered effective in the reduction of atmospheric CO 2 because of their ability to reduce energy consumption of buildings and sequester carbon in plants and substrates. However, green roof system components (substrate, water proofing membrane, etc.) may cause CO 2 emissions during their life cycle. Therefore, to assess the CO 2 -payoff for extensive green roofs, we calculated CO 2 payback time it takes their CO 2 sequestration and reduction to offset the CO 2 emitted during its production process and maintenance practices. The amount of CO 2 emitted during the production of a modular green roof system was found to be 25.2 kg-CO 2 ·m −2 . The annual CO 2 emission from the maintenance of green roofs was 0.33 kg-CO 2 ·m −2 ·yr −1 . Annual CO 2 sequestration by three grass species with irrigation treatment was about 2.5 kg-CO 2 ·m −2 ·yr −1 , which was higher than that of Sedum aizoon . In the hypothetical green roofs, annual CO 2 reduction due to saved energy was between 1.703 and 1.889 kg-CO 2 ·m −2 ·yr −1 . From these results, we concluded that the CO 2 payback time of the extensive green roofs was between 5.8 and 15.9 years, which indicates that extensive green roofs contribute to CO 2 reduction within their lifespan.

Suggested Citation

  • Takanori Kuronuma & Hitoshi Watanabe & Tatsuaki Ishihara & Daitoku Kou & Kazunari Toushima & Masaya Ando & Satoshi Shindo, 2018. "CO 2 Payoff of Extensive Green Roofs with Different Vegetation Species," Sustainability, MDPI, vol. 10(7), pages 1-12, June.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:7:p:2256-:d:155402
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    References listed on IDEAS

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    1. Sherwani, A.F. & Usmani, J.A. & Varun, 2010. "Life cycle assessment of solar PV based electricity generation systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 540-544, January.
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    1. Mihalakakou, Giouli & Souliotis, Manolis & Papadaki, Maria & Menounou, Penelope & Dimopoulos, Panayotis & Kolokotsa, Dionysia & Paravantis, John A. & Tsangrassoulis, Aris & Panaras, Giorgos & Giannako, 2023. "Green roofs as a nature-based solution for improving urban sustainability: Progress and perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 180(C).
    2. Sri Yuliani & Gagoek Hardiman & Erni Setyowati, 2020. "Green-Roof: The Role of Community in the Substitution of Green-Space toward Sustainable Development," Sustainability, MDPI, vol. 12(4), pages 1-14, February.
    3. Saeed Ur Rahman & Zia Ur Rahman & Maryam Ibrahim, 2022. "Validity of Environmental Kuznets Curve in the Malaysian Economy: A Fresh Evidence," Journal of Economic Impact, Science Impact Publishers, vol. 4(3), pages 278-288.
    4. Dong, Xin & He, Bao-Jie, 2023. "A standardized assessment framework for green roof decarbonization: A review of embodied carbon, carbon sequestration, bioenergy supply, and operational carbon scenarios," Renewable and Sustainable Energy Reviews, Elsevier, vol. 182(C).
    5. Elaouzy, Youssef & El Fadar, Abdellah, 2023. "Sustainability of building-integrated bioclimatic design strategies depending on energy affordability," Renewable and Sustainable Energy Reviews, Elsevier, vol. 179(C).

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