![]() Recent studies have indicated that greening just 6% of the City of Toronto's rooftops could reduce summer temperatures by 1 - 2 degrees C, saving an estimated $1.0 million in energy costs per year! This is because cities replace natural landscape with hard, impermeable surfaces. This effect, illustrated to the right, describes the phenomenon of cities being several degrees hotter than the surrounding countryside. ![]() It cools air around the building and reduces the urban heat island effect.It filters particles from the air and converts carbon dioxide into oxygen 1.0 m 2 (10.76 ft 2) of uncut grass can remove 0.2 kg of particulates from the air and fulfill one person's oxygen requirements during one year!.GREEN ROOF BENEFITS FOR ZOO AND VISITORS! To the right is an illustration of the various layers that make up a green roof. Green roofs, also known as 'living roofs' or 'eco-roofs', are the wave of the future in sustainable design, and the Toronto Zoo is surfin' right along with them! While the term 'green roof' could mean many things, it refers here to a roof with one or more extra membranes, including a waterproof and root-proof section that is covered by various types of vegetation.
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