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Public Perceptions of Green Roofs and Green Walls in Tokyo, Japan: A Call to Heighten Awareness

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Abstract

Many cities advocate retrofitting green roofs and green walls (GRGW) to create additional green areas, especially in cramped urban areas. Yet, worldwide, only a handful of studies have evaluated the public views towards the benefits and negative issues and promotion policies of this innovative greening option. To address this gap in the literature, we conducted a survey (N = 500) of residents’ opinions towards GRGW in Tokyo, a city with mandatory installation of GRGW for almost two decades. Respondents mostly agreed with the contribution of GRGW to thermal comfort, air quality, and cityscape but weakly endorsed other potential benefits. High costs as well as mosquitoes and plant litter nuisances were the most recognized negative issues. Mandatory installation was the least preferred promotion policy. Instead, respondents expected installation on public buildings and provision of installation guidance. Respondents predominantly held a “moderate” view towards both the benefits and negative issues, showing indifferent attitudes towards GRGW. Income level and housing type shaped the overall perceptions, whereas age, sex, and current living environment influenced perceptions of individual aspects. Our findings signified a need for a bottom-up strategy to heighten public awareness for the advanced development of GRGW to complement and prime the top-down mandatory installation policy.

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Acknowledgements

We acknowledge with gratitude the funding support awarded by a Research Matching Grant Scheme of the University Grants Council of Hong Kong. The grant support for field studies in Tokyo provided by the Faculty of Liberal Studies and Social Sciences of the Education University of Hong Kong is warmly appreciated. Parts of this research were supported by the FEAST Project (No. 14200116), Research Institute for Humanity and Nature (RIHN), and by JSPS KAKENHI Grant Numbers JP20K15552 and JP20K21030. We thank the professional questionnaire survey service provided by Rakuten Research, Inc. in Tokyo.

Author contributions

Conceptualization: CYJ; Funding acquisition: CYJ; Methodology: CYJ; Formal analysis and investigation: CYJ and LCH; Project administration: CYJ and CDDR; Writing‒original draft preparation: LCH; Writing‒review and editing: CYJ and CDDR.

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  1. Department of Social Sciences, Education University of Hong Kong, Lo Ping Road, Tai Po, Hong Kong, China

    C. Y. Jim & Ling Chui Hui

  2. Department of Environmental Design, Faculty of Collaborative Regional Innovation, Ehime University, Ehime, Japan

    Christoph D. D. Rupprecht

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Jim, C.Y., Hui, L.C. & Rupprecht, C.D.D. Public Perceptions of Green Roofs and Green Walls in Tokyo, Japan: A Call to Heighten Awareness. Environmental Management 70, 35–53 (2022). https://doi.org/10.1007/s00267-022-01625-8

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