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2. DC Tower 1, Vienna, Austria The facade on this 60-storey building is mostly made of glass, which means daylight can easily be used to replace artificial light. The building runs on green electricity and offers water-saving showers and bathrooms.

第二名：奧地利維也納DC大廈1號塔。樓體表面由玻璃制成，白天光線充足。大樓使用綠色電力，節水淋雨浴室。