The NYT has a small series of essays on clotheslines (vs. dryers). This guy posted an essay on a study in hotels that got significantly more of the desired behavior (reusing towels) by in-room cards that said that most other people did so as well. Important to know when trying to foster sustainable behavior.
http://roomfordebate.blogs.nytimes.com/2009/10/25/rethinking-laundry-in-the-21st-century/#robert
John Gear
United States
http://lovesalem.blogspot.com/