White roofs are not a global warming silver bullet, study finds

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Repeindre les toits en blanc ne refroidira pas la planète

Un volontaire repeint en blanc le toit d’une école à New York pour assurer au bâtiment un meilleur refroidissement © AFP PHOTO/Emmanuel Dunand

Plans to slow climate change by reflecting sunlight back into space could in fact raise temperatures, a new study concludes

Seemed like a cool idea: paint the world’s roofs white to reflect more sunlight, and it could help cool down both cities and the planet. A new study, however, finds it’s a lot more complicated – even as it dispels climate change deniers’ claims that urban “heat islands” are a major cause of apparent temperature increases.

Guardian

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