Commended as the inspiration of sustainability, the Green Lighthouse by Christensen & Co Architects did a ground breaking last October 29, 2008. The building has a great structural design, which is not only beautiful to our eyes but is also use to reduce CO2 emissions. Why it is called as sustainable? Simply because the proportion between windows and façade has been carefully calculated to make sure that the building will not consume large amount of energy for heating. What’s good about this building is that it has the ability to collect excess solar energy during the summertime and put it in an underground store and use it later when the power of the sun is out.