A rigorous green certification system is recognizing the next phase of eco design, which its founders describe as "the world's greenest buildings."

Founded by Jason F. McLennan in 2009 through the Cascadia Green Building Council, the Living Building Challenge (LBC) is a green ratings system for design and construction that judges a building based on its actual performance, not just its projected performance at the design stage.

To date, it has recognized six buildings for their green credentials. Only three have been successful in meeting all its stringent requirements and consequently fully certified as "living."

http://www.cnn.com/2012/06/21/world/living-building-challenge/index.html