Green Roof

Description:
Sometimes called a “vegetative” roof, a green roof uses the space on top of a building for growing plants and gardens. In areas where it rains a lot, this is a very good way to deal with runoff while providing a park-like setting in a very unexpected place.

Cool roof

Description:
Metal roofs have a high albedo, which means they reflect a lot of light. This makes them one type of a “cool roof,” because by reflecting the light, they don’t heat up.