Micro House Living, Affordable ADUs, Heritage Efficiency, + Solar Popularity By Preston on May. 7, 2011 | Topics: Week in Review | View Comments Betting on the micro-housing trend . Post-consumer recycled plastic is the answer. Using backyard cottages for affordable housing . What’s the energy cost of saving old buildings ? EPA takes action on spray polyurethane foam . Five steps to manufacture LED lights . Top ten solar states in U.S. Check out the latest green jobs and subscribe to our weekly newsletter for updates, article summaries, newsworthy links, and other site news. If you enjoyed this article, get new articles and more by subscribing to our Daily RSS or Weekly Email .