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：奥地利维也纳DC大厦1号塔。楼体表面由玻璃制成，白天光线充足。大楼使用绿色电力，节水淋雨浴室。