Green roof cooling and carbon mitigation benefits in a subtropical city

Urbanization substantially changes the urban climate, exacerbating the urban heat island (UHI) effect (Chen and Ng, 2012), raising ambient temperatures, and reducing outdoor thermal comfort (Bohnenstengel et al., 2011). Increased urban heat poses significant threats to human health, such as elevated risks of cardiovascular disease (Mastrangelo et al., 2007, Phelan et al., 2015, Santamouris, 2015, Oikonomou et al., 2018). At the same time, increased temperatures result in higher building energy consumption for air-conditioning and more burning of fossil fuels, which increases carbon emissions (Shafique et al., 2020). A lack of adequate attention to deploying effective mitigation strategies in rapidly growing cities might further exacerbate the negative impacts of UHIs.

Pavements and concrete buildings usually have relatively high thermal mass, low heat capacity, and low albedo. Much of the absorbed solar radiation is converted into sensible heat, raising the outdoor air temperature (Evola et al., 2017). Green spaces, cool roofs (highly reflective roofs), and green roofs are effective climate change mitigation measures as they have been shown to cool the urban thermal environment Read More  

 ?Green Roofs, Living Walls, and Green Infastructure