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1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata.Got a minute?
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2 .No wonder it's gonna be a hot time in the old town tonight.
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3 .Cities can be anywhere from two to 20 degrees Fahrenheit hotter than nearby countryside, due to what's known as the "urban heat island" effect.
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4 .But when heat waves roll through, they interact synergistically with the urban heat island, boosting temperatures even higher than you might expect.
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5 .Researchers used a June 2008 heat wave in Baltimore as a case study.
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6 .They compared temperatures downtown to those near the Baltimore/Washington International Airport, a residential, half-forested area.
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7 .Using modeling software, they found that temperatures downtown weren't simply a sum of the urban heat island and the heat wave,
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8 .they were three and a half degrees hotter than that.
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9 .The results appear in the Journal of Applied Meteorology and Climatology.
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10 .Urban areas are carpeted in asphalt and concrete, which don't hold water like soil and vegetation do.
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11 .So while the countryside sweats during a heat wave, cooling itself through evaporation, the city just bakes.
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12 .But researchers say there's a simple solution to beat the heat: install green roofs, and plant some trees.
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13 .Which would help the concrete jungle live up to the second half of its name.
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14 .Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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