The availability of appropriately sized green spaces within cities has become a necessity. Persistent urban expansion together with the aggravating problems of environmental, visual and noise pollution are behind this. If planning policies ignore allocating adequate green regions, modern cities will even turn into a concrete jungle after decades of expansion. The thing, which results in a very high rate of carbon and very high temperature exceeding the limits. Green roofs emerge as the most suitable, the least expensive and technically the easiest solution to adapt green spaces because of the extremely expensive cost of redistributing or enlarging green spaces inside cities. This research inspects the concept of green roofs tackling its applications and various benefits, the environmental, economic, social and aesthetic ones. The research case studies some green roofs’ implementations in western cities on both public and private buildings. At the end, the research derives some propositions possible to apply to the Syrian cities under the surrounding conditions.