China v. US--Top Down v. Bottom Up Green Building Standards

Via @allroads on Twitter, I found an interesting presentation on the difference between green building standards in China and the United States. As I discussed here China takes a top down approach to mandating environmental change. In the United States, it is a more bottom up, market based approach. We will see how/if this changes with a more environmentally interested president in the White House. Do you think top-down or bottom-up is more effective?