The specific type of heat that rises off concrete and asphalt long after the sun has set is familiar to anyone who has strolled through a tropical metropolis in the middle of the afternoon. This phenomenon is known to scientists as the "urban heat island effect." Due to its near-equator location and year-round warmth, Singapore has more incentive than other cities to take that effect seriously. As a result, researchers there opted to test a solution that had, until then, mostly existed in labs and computer models.
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