Smart, green, productive and efficient buildings contribute to urban efficiency and high-performance cities. Buildings don’t turn green with a fresh coat of paint, and building green is not an afterthought. Green, net zero building principles encompass the entire life cycle of a building—from the design and construction phases to the operation and maintenance of the building. Green buildings efficiently select and use resources and engage occupants to live and work in the buildings in a sustainable manner.  Those that match their energy demand with on-site energy production can achieve “net-zero” status. Increasingly, green and net zero buildings are demonstrating real market traction - and the benefits are becoming clear. Photo credit: Brad Kahn/Flickr