Green roofs are becoming a common phenomenon when it comes to sustainable architecture. The increased urbanization and industrialization of cities has led to the eradication of plenty of urban green spaces on ground which influences pollution and climate change making the cities less breathable. Many countries around the world have mandated the adoption and implementation of green roofs on newly constructed buildings because of the multiple benefits and ecosystem services they provide, in an attempt to reduce the impact of human activities and climate change. This dissertation talks about the evolution of green roofs, the benefits of green roofs which include mitigating urban heat island effects, reduction of pollution, energy saving, increased biodiversity among others.