Green Walls

I found an article at Seattle Times online that talked about PNC Financial Services installing a green wall on the side of their headquarters. The wall is described as being the size of two tennis courts. The purpose of the wall is not only for an art piece but to provide vegetation, the benefits of natural insulation and removal of air pollutants. The wall covers nearly 2,400 square feet of the building but only requires about 15 minutes of watering in the peak season and less during the winter. The water is provided by the building's plumbing system. The biggest benefit of the green wall is to help cool the buildings through shading. The wall also captures water and releases it back into the atmosphere and storm water systems more slowly. Green Living technologies is the designer of the wall and also says that the wall can offset carbon output for one person daily!

http://seattletimes.nwsource.com/html/localnews/2010046023_apusgreenwalls1stldwritethru.html