Geo-Engineering Cities Using White Roofs and Pavements


The long-term effect of increasing the albedo of urban areas (11 page pdf, Hashem Akbari, H Damon Matthews, Donny Seto, Environmental Research Letters, Apr. 12, 2012)

Also discussed here: Resurfacing Urban Areas to Offset 150 Billion Tons of CO2 (ScienceDaily, Apr. 13, 2012)

Today, we review a look at changing the albedo of urban areas of the world and then estimating how much this would reduce climate warming in terms of offset CO2. The key “dark”, and therefore highly absorbing, surfaces of most cities are the black roofs and pavements which make up 60% of the area and are normally replaced every decade or two. By increasing the albedo of urban areas in a global climate model and running a simulation for 80 years ahead, the authors estimated a CO2 offset of between 130 and 150 billion tones- equivalent to taking every car in the world off the road. These reductions could be put into effect by changes at the municipal level with benefits in terms of reduced urban heat islands and urban smog.

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

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