Extensive green roofs are lightweight, low-maintenance roofing systems that support a variety of plants, primarily sedums and grasses. They are designed to cover large areas and require minimal soil depth, typically around 2 to 6 inches. These roofs help improve urban biodiversity, reduce heat, and manage stormwater by absorbing rainwater. These green roofs are often installed on commercial buildings and residential homes, providing insulation and reducing energy costs. They also contribute to improved air quality and can enhance the aesthetic appeal of urban environments. Overall, extensive green roofs are an effective way to promote sustainability in cities.