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Paris, France—White or reflective paint is more effective at cooling cities than covering roofs in solar panels or greenery, scientists say, and could offer some relief on extremely hot summer days.
The results, published on Thursday in the journal Geophysical Research Letters, found that if adopted widely, cool roofs could reduce the surrounding temperature between 1.2C to 2C. “We comprehensively tested multiple methods that cities like London could use to adapt to and mitigate warming temperatures, and found that cool roofs were the best way to keep temperatures down during extremely hot summer days,” said the study’s lead author, Oscar Brousse from UCL.
“By reflecting rather than absorbing heat, cool roofs have the dual benefit of not only cooling the outside urban environment, but the inside of buildings as well,” the report said.A separate study published in March looked at real-world results from painting not just roofs, but also roads and outside walls white in an industrial district of Singapore.
Among other locations, cool roofing has already been rolled out in Greece, which is vulnerable to scorching summer highs, and parts of India where heatwaves can be extreme.
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