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The Tree House serviced apartments had set a Guinness World Record with the world’s largest vertical garden. The building’s green wall measures 24 storeys tall and is expected to save more than $500,000 in energy and water costs annually. A natural insulation, it's primary function is to serve as a vertical green lung and it also has a rainwater harvesting system. Three sky gardens add to the vertical greening at the 7th, 13th and 19th floors. Photo by Suzanne Lee/Panos Pictures