13 Apr '12, 1pm

Global warming scientists foresee sun-reflecting cities

Global warming scientists foresee sun-reflecting cities

Scientists sketched a vision on Friday of converting the world's cities into giant sunlight reflectors to help fight global warming but met with skepticism from fellow academics. Gradually replacing traditional urban roofs and roads with white or lighter-colored materials would yield a cooling benefit that, over 50 years, would be the equivalent of a reduction of between 25 and 150 billion tons of carbon dioxide, researchers in Canada said. At the top end of the scale, this equals the emissions of all the world's cars over the same period, their study published in Britain's Institute of Physics ' journal Environmental Research Letters stated. Light-colored materials help reflect the Sun's rays rather than absorb and convert them into heat, a phenomenon known as albedo in scientific terms. Pavements and roofs make up more than 60 percent of urban surfaces and, by trapping s...

Full article: http://www.mnn.com/earth-matters/energy/stories/global-wa...

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