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Quick answer：Green roofs are a form of rooftop gardening that incorporates vegetation into the design of a building's roof. They are used for aesthetic, environmental, and functional benefits. In the case of a Japanese shopping mall, a green roof can help insulate the building, improve air quality, provide additional green space, and reduce urban heat island effects. The image you mentioned likely showcases a green roof that is part of the mall's architectural design, possibly featuring a variety of plants and horticultural elements.
