Fixing Our Urban Heat Islands
The materials used in the construction of the modern city create an interesting response to the rays of the sun. Due to an overall lack of vegetation and evaporation our cities experience average temperatures much higher than their rural and less developed surroundings.
The issue is the reflection of heat rather than absorption. Impervious surfaces such as streets, dark rooftops and concrete reflect the heat from the sun. In contrast, trees, grasses, mosses, and vegetation in general absorb the heat instead of reflecting it leading to cooler temperatures. With the reintroduction of green space and green roofs architects and scientists can ease the effects of our urban heat islands.
Above is an artists rendering of a possible solution for the city of Melbourne.
The benefits of green space on street level as well as on the top of buildings has multiple benefits. A green roof can save on energy costs because it serves as natural insolation, not allowing heat or air conditioning to escape.
Green roofs also improve air quality in urban areas. The vegetation acts as a natural filter effectively cleaning some of the pollution from the air.
Another massive benefit to green space is the social impact. Green roofs can acts as parks and recreation areas. They have the power to be functional, aesthetically pleasing, and socially beneficial.