Increasing housing density and increase in ambient temperature compared with the country territories – now well-known phenomenon that became known as the "urban heat island." Many researchers predict that green roofs could become a tool with which you can reduce overheating of the big city in the summer. The presence of vegetation on the roof closely mimics the natural environment, thus increasing the amount of greenery, the evaporating moisture and provide shade on the roof surface. Evaporation plant, located on the roof, as well as "shadowing" roofs – the main factors influencing passive cooling of roof in the hot season. As a consequence of these factors reduces the ambient temperature, because less heat is reflected back into the atmosphere. The vegetation on the roofs of the town a positive effect on ambient air quality, because it "captures" solid particles in the air, and also binds carbon dioxide – the main product of "breathing" of the city. Green roofs are becoming more successful habitat for various rare and endangered species.
It is reported that in London alone on a series of green roofs biologists have discovered more than 50 species of spiders. In Germany, on the green roofs were observed nesting sites of rare birds. Thus, green roofs could help in increasing the diversity of wildlife, although this advantage is heavily dependent on geographic features. Green roof – a space created by the addition of over a traditional roof system of additional layers of fertile soil and plants. Not to be confused with the traditional green roof, roof garden, where plants are located in freestanding containers (tubs) on the roof terrace or operated parking facilities. .