The color of the roof there is a traditional red brick, blue, black, dark green, and others. Very rarely do we see the white roof. For buildings with no cement was used to follow the color is gray.
It turns out for us who live in tropical and hot, white roofs can reduce air conditioning usage by 20%. The state of California in the United States even require that all new buildings, since 2005, white-roofed, for flat roof surfaces or applicable.
The surface of the roof covering on average 25% of the entire surface of the city. While the streets covering about 35% of the entire surface of the city. According to research from Hashem Akbari, a researcher of the Heat Island Group, when 100 cities in the world to replace the roof with a white color, and also streets with a more reflective material, such as concrete roads than paved roads, then the resulting global cooling effect would be enormous.