As our world becomes more urbanized, and our cities continue to grow, we are replacing the natural environment with buildings, pavement, and asphalt. This causes a phenomenon called urban heat island effect, in which the proximity of urban buildings makes cities several degrees warmer than rural areas. We are starting to realize that we need to counteract this harmful effect and that cooling the roof is one of the best ways of doing so. Many roofing options will accomplish the goal of combating urban heat island effect, including reflective roofs and roof gardens.