Next Article in Journal
Low-Input Herbicide Management: Effects on Rapeseed Production and Profitability
Previous Article in Journal
Subway Opening, Traffic Accessibility, and Housing Prices: A Quantile Hedonic Analysis in Hangzhou, China
Article

CO2 Payoff of Extensive Green Roofs with Different Vegetation Species

1
Center for Environment, Health and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan
2
Kyodo KY-Tec Corporation, 1-15-1, Ebisu-minami, Shibuya-ku, Tokyo 150-0022, Japan
*
Author to whom correspondence should be addressed.
Sustainability 2018, 10(7), 2256; https://doi.org/10.3390/su10072256
Received: 6 June 2018 / Revised: 26 June 2018 / Accepted: 27 June 2018 / Published: 30 June 2018
Green roofs are considered effective in the reduction of atmospheric CO2 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 CO2 emissions during their life cycle. Therefore, to assess the CO2-payoff for extensive green roofs, we calculated CO2 payback time it takes their CO2 sequestration and reduction to offset the CO2 emitted during its production process and maintenance practices. The amount of CO2 emitted during the production of a modular green roof system was found to be 25.2 kg-CO2·m−2. The annual CO2 emission from the maintenance of green roofs was 0.33 kg-CO2·m−2·yr−1. Annual CO2 sequestration by three grass species with irrigation treatment was about 2.5 kg-CO2·m−2·yr−1, which was higher than that of Sedum aizoon. In the hypothetical green roofs, annual CO2 reduction due to saved energy was between 1.703 and 1.889 kg-CO2·m−2·yr−1. From these results, we concluded that the CO2 payback time of the extensive green roofs was between 5.8 and 15.9 years, which indicates that extensive green roofs contribute to CO2 reduction within their lifespan. View Full-Text
Keywords: building energy savings; CO2 emission; CO2 payback time; CO2 sequestration; extensive green roof; inventory analysis building energy savings; CO2 emission; CO2 payback time; CO2 sequestration; extensive green roof; inventory analysis
Show Figures

Figure 1

MDPI and ACS Style

Kuronuma, T.; Watanabe, H.; Ishihara, T.; Kou, D.; Toushima, K.; Ando, M.; Shindo, S. CO2 Payoff of Extensive Green Roofs with Different Vegetation Species. Sustainability 2018, 10, 2256. https://doi.org/10.3390/su10072256

AMA Style

Kuronuma T, Watanabe H, Ishihara T, Kou D, Toushima K, Ando M, Shindo S. CO2 Payoff of Extensive Green Roofs with Different Vegetation Species. Sustainability. 2018; 10(7):2256. https://doi.org/10.3390/su10072256

Chicago/Turabian Style

Kuronuma, Takanori, Hitoshi Watanabe, Tatsuaki Ishihara, Daitoku Kou, Kazunari Toushima, Masaya Ando, and Satoshi Shindo. 2018. "CO2 Payoff of Extensive Green Roofs with Different Vegetation Species" Sustainability 10, no. 7: 2256. https://doi.org/10.3390/su10072256

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop