Solarpunk Urbanism

Climate resilience: Has the time come to start demanding lighter-coloured streets in hotter climates?

At this stage, the challenge with climate change is not just preventing it from happening by cutting emissions. We also need to make our cities resilient to the climate change we've already locked in.

That's where lighter coloured paving for streets, rather than dark asphalt, can help:

"Sebastian Pfautsch doesn't hesitate when asked what he would change first to cool Australian cities in summer.

"And it's not what you might expect. It's not the seemingly endless expanse of black roofs, soaking up the sun beneath a shimmering haze.

"It's the roads. About a third of any outer suburb is thermally dense black asphalt that can reach 75 degrees Celsius, according to Professor Pfautsch, an expert on urban heat at the University of Western Sydney.

...

"Lighter-coloured roads may make intuitive sense, like wearing a white shirt on a hot day, but how effectively do they reduce surface and ambient air temperature?

"In 2020, two separate cool roads trials in Sydney and Adelaide set out to conclusively answer these questions.

"The Sydney trial, which took place at about 10 sites in the Western Sydney suburbs of Blacktown, Campbelltown and Parramatta, recorded an average surface temperature reduction of 5.6C and 2C for day and night respectively.

"For context, tree shade reduced the surface temperatures of roads by 16C."

https://www.abc.net.au/news/science/2024-01-24/why-australia-builds-dark-roads-despite-heatwaves-climate-change/103375122

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