This is a repost from Greentech Media about the growing focus on building/retrofitting buildings that have very low or no net energy usage. The numbers are surprising. Sixty low- or no-energy buildings offer a (high-performance, glazed) window into the future. Take a look.

http://www.greentechmedia.com/articles/read/going-net-zero-for-less-than-10-percent-added-cost/