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This is Scientific American 60-Second Science. I'm Christopher Intagliata.Got a minute?

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No wonder it's gonna be a hot time in the old town tonight.

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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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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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Researchers used a June 2008 heat wave in Baltimore as a case study.

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They compared temperatures downtown to those near the Baltimore/Washington International Airport, a residential, half-forested area.

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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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they were three and a half degrees hotter than that.

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The results appear in the Journal of Applied Meteorology and Climatology.

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Urban areas are carpeted in asphalt and concrete, which don't hold water like soil and vegetation do.

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So while the countryside sweats during a heat wave, cooling itself through evaporation, the city just bakes.

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But researchers say there's a simple solution to beat the heat: install green roofs, and plant some trees.

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Which would help the concrete jungle live up to the second half of its name.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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