| http://www.w3.org/ns/prov#value | - It???s a green trend that got a major boost after a series of deaths in Chicago during a terrible heat wave in the 1990s that killed 750 people and led Mayor Richard M. Daley to search for ways to reduce what was then known as the ???urban heat island effect,??? caused by a concentration of too many surfaces that absorb heat, especially asphalt and cement.
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