Urban heat mitigation by green and blue infrastructure: drivers, effectiveness, and future needs

Kumar, Prashant; Debele, Sisay; Khalili, Soheila; Halios, Christos H.; Sahani, Jeetendra; Aghamohammadi, Nasrin; de Fatima Andrade, Maria; Athanassiadou, Maria; Bhui, Kamaldeep; Calvillo, Nerea; Cao, Shi-Jie; Coulon, Frederic; Edmondson, Jill L.; Fletcher, David ORCID:; Dias de Freitas, Edmilson; Guo, Hai; Hort, Matthew C.; Katti, Madhusudan; Kjeldsen, Thomas Rodding; Lehmann, Steffen; Locosselli, Giuliano Maselli; Malham, Shelagh K.; Morawska, Lidia; Parajuli, Rajan; Rogers, Christopher DF.; Yao, Runming; Wang, Fang; Wenk, Jannis; Jones, Laurence ORCID: 2024 Urban heat mitigation by green and blue infrastructure: drivers, effectiveness, and future needs. The Innovation, 5 (2), 100588. 21, pp.

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The combination of urbanisation and global warming leads to urban overheating and compounds the frequency and intensity of extreme heat events due to climate change. Yet, the risk of urban overheating can be mitigated by urban green-blue-grey infrastructures (GBGI), such as parks, wetlands, and engineered greening, which have the potential to effectively reduce summer air temperatures. Despite many reviews, the evidence bases on quantified GBGI cooling benefits remains partial and the practical recommendations for implementation are unclear. This systematic literature review synthesises the evidence base for heat mitigation and related co-benefits, identifies knowledge gaps, and proposes recommendations for their implementation to maximise their benefits. After screening 27,486 papers, 202 were reviewed, based on 51 GBGI types categorised under 10 main divisions. Certain GBGI (green walls, parks, street trees) have been well-researched for their urban cooling capabilities. However, several other GBGI have received negligible (zoological garden, golf course, estuary) or minimal (private garden, allotment) attention. The most efficient air cooling was observed in botanical gardens (5.0±3.5°C), wetlands (4.9±3.2°C), green walls (4.1±4.2°C), street trees (3.8±3.1°C), and vegetated balconies (3.8±2.7°C). Under changing climate conditions (2070-2100) with consideration of RCP8.5, there is a shift in climate subtypes, either within the same climate zone (e.g., Dfa to Dfb and Cfb to Cfa) or across other climate zones (e.g., Dfb (continental warm-summer humid) to BSk (dry, cold semi-arid) and Cwa (temperate) to Am (tropical)). These shifts may result in lower efficiency for the current GBGI in the future. Given the importance of multiple services, it is crucial to balance their functionality, cooling performance, and other related co-benefits when planning for the future GBGI. This global GBGI heat mitigation inventory can assist policymakers and urban planners in prioritising effective interventions to reduce the risk of urban overheating, filling research gaps, and promoting community resilience.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Soils and Land Use (Science Area 2017-)
ISSN: 2666-6758
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: nature-based solutions, heat mitigation, climate change, urban cooling, heat stress, sustainable development goals
NORA Subject Terms: Ecology and Environment
Meteorology and Climatology
Date made live: 16 Feb 2024 13:25 +0 (UTC)

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