How Can Green and Cool (light-coloured) Roofs Mitigate Urban Heating?


The effectiveness of cool and green roofs as urban heat island mitigation strategies (17 page pdf, Dan Li, Elie Bou-Zeid and Michael Oppenheimer, Environmental Research Letters, May 2, 2014)

Today we review research on the urban heat island effect and how green roofs and high albedo “cool” roofs may be used to mitigate the amount of heating – which is becoming an even more important aspect, as global climate warming continues to increase the frequency and severity of heat waves in cities with the resultant growing impact on health. Results of the modeling show that over 90% of the roofs have to be green or cool in order to reduce the average air temperature by 0.5 C. Also, the soil moisture is critical for green roofs as dry soil has minimal effect on cooling.

green roofs

To see Key Quotes and Links to key reports about this post, click HERE

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