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is common and popular in the country. is a demonstration project and costs the city government 1.5 million dollars. will make the ordinary cooling down of the city in summer unnecessary. aims at getting people involved and understanding their impact on the environment.
It was built ninety years ago and is the most outstanding feature in the center of the city. It is originally proper to build a garden on the top of the City Hall. The temperature on its top is a little bit higher than that on the street below. It is the first building in America to have a garden on it.
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Because the City Hall is large. Because the mayor had urged the environmental department to do so. Because it can make people understand their impact on environment better through a public building. Because the experts just want to make the City Hall a convenient laboratory.
Every year, Chicago spends about $ 4,000 on cooling the city. The design of the garden on the City Hall specially takes weight the roof can stand into consideration. The Mayor urged the environmental department to look into rooftop gardens in Hamburg and build similar ones in America. Heat islands mainly refer to those dark colored rooftops which receive and retain heat and will not easily release the heat.
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田园城市Garden City) 城市历史保护 城市功能分 区域规划思想
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