What is a "green roof"?

A "green roof" refers to a roof that is covered with vegetation and an appropriate growing medium, which often includes soil and plants. This type of roofing system helps to create a habitat for wildlife, contributes to biodiversity, and provides numerous environmental benefits. Green roofs can help with urban heat island reduction, improve air quality, and manage stormwater by absorbing rainwater, reducing the amount of runoff.

In addition to ecological advantages, green roofs can also enhance the aesthetics of buildings and provide insulation, lowering energy costs. They are part of a broader category of sustainable architecture and landscape practices aimed at minimizing the environmental impact of urban settings. The other options, while relating to roofs in various ways, do not capture the full concept and intent of what a green roof truly represents.