【ItisofficiallyknownastheSwissReTower，or30StMaryAxe．Asatypicalexampleofgreenarchitecture，whatismostremarkableaboutthebuildingisitsenergy-efficiency．（51）___itsartfuldesignandsomefancytechnology，itisexpec】

　　It is officially known as the Swiss Re Tower，or 30St Mary Axe．As a typical example of green architecture，what is most remarkable about the building is its energy-efficiency．（51）___ its artful design and some fancy technology，it is expected to consume up to 50% less energy than a comparable conventional office building．Green architecture is （52）___ the way buildings are designed，built and run．

　　Supporters of green architecture argue that the approach has many （53）___．In the case of large office，for example，the （54）___ of green design techniques and clever technology can not only reduce energy consumption and environmental impact，but also reduce running costs，create a more （55）___ working environment，improve employee's health and productivity，reduce legal liability，and （56）___ property values and rental returns．

　　Going green saves money by reducing long-term energy costs：a survey of 99green buildings in America found that on average，they use 30% less energy than conventional buildings．So any additional building costs can be （57）___ quickly．The traditional approach of trying to minimize construction costs，（58）___，can lead to higher energy bills and wasted materials．

　　Green buildings can also have less obvious （59）___ benefits．The use of natural daylight in office buildings，for example，besides reducing energy costs，also seems to make workers more productive．Lockheed Martin，an aerospace firm，found that absenteeism（缺勤） （60）___ by 15after it moved 2，500employees into a new green building in Sunnyvale，California．（61）___，the use of daylight in shopping complexes appears to increase （62）___．It also found that students in naturally lit classrooms performed up to 20% better．The （63）___ in productivity paid for the building's higher construction costs within a year．Despite its benefits and its growing popularity，green architecture is still not as popular as expected．The main （64）___ is co-ordination（协调），for green buildings require much more planning