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What obstacles do you think sustainable architecture is facing?
USGBC once set two goals in 2007: 100,000 LEED-certified buildings and 1 million LEED-certified homes by the end of 2010. While according to the data it announced in 2011, the number of homes with LEED certification has reached to 10,000 across the US. Yet, no matter whether the previous 1 million goal was produced through sophisticated calculation or basically just a number with hope, when comparing our hope with the reality in these years development of sustainable architecture, what are the real obstacles or problems in your opinion that hinders the booming of sustainable architecture?