The lack of green areas in towns and cities not only creates a negative aesthetic and social impact, it also helps to increase the air temperature through what is known as the “Urban Heat Island” (UHI) effect.
Thermal imaging shows us that built-up areas absorb more sunlight than vegetated areas, acting like a heat storage unit. Once released, that heat raises the air temperature and leads to increased energy consumption through air conditioning in warm weather.
Green roofs (or vegetated roofs) create vegetated ground on the open roof spaces of city buildings and help to combat the UHI effect through cooling action produced by the daily evapotranspiration cycles of plants.