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Effects of Global Warming may be Reduced by Painting Your Roof White
According to a report in Live Science, the study simulated the effects of painting roofs white to reflect incoming solar rays and found that it could help cool cities and reduce the effects of global warming.
"Our research demonstrates that white roofs, at least in theory, can be an effective method for reducing urban heat," said Keith Oleson, the lead author of the study and a researcher at the National Center for Atmospheric Research (NCAR) in Boulder, Colorado.
"It remains to be seen if it's actually feasible for cities to paint their roofs white, but the idea certainly warrants further investigation," he added.
Cities are particularly vulnerable to climate change because of a phenomenon known as the urban heat island effect.
The asphalt roads, tar roofs and other artificial surfaces that permeate cities absorb heat from the sun, making temperatures in urban areas on average 2 to 5 degrees Fahrenheit (1 to 3 degrees Celsius) higher than in rural areas.
"It's critical to understand how climate change will affect vulnerable urban areas, which are home to most of the world's population," said NCAR scientist Gordon Bonan, a co-author of the study.
White roofs could reflect some of that heat back to space and cool temperatures, because white surfaces reflect most of the light that hits them, while black surfaces absorb most of that light.
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