The metamaterial film can both reflect nearly all incoming solar energy back into the atmosphere and shed heat through infrared thermal radiation. WikipediaUrban and metropolitan areas produce urban heat islands whereby infrastructure acts to impact the natural climate of the area. Roofing, and specifically cool roofing is a major factor in reducing the localized urban heat island effect. This effect can be limited in scope by cool roofing, albeit dependent on where the urban city is located geographically. However, in northern climates, cities must grapple with the trade-offs between energy efficiency and the potential unwanted effects of an urban heat island.

Source: Forbes July 28, 2017 16:52 UTC