Active design does not end at the building. It also extends to the surrounding spaces, where landscaping will affect the climate internally in the bUildings. Trees, bushes and grass have a cooling effect due to evapotranspiration from their surfaces which cool the ambient air, a shading effect and a low reflectivity of heat. Pavements, which absorb and reflect heat, must be avoided. Ibe external environment is particularly important in the hot climatic zones, where most people spend a great deal of their time outdoors. Ibe outdoor areas should be treated as an extension of the living and working spaces.