insulation

http://www.ecohome.net/guide/different-types-insulation
http://www.houzz.com/ideabooks/14262229/list/Ecofriendly-Cool–Insulate-With-Wool–Cork–Old-Denim-and-More
http://www.treehugger.com/green-architecture/greener-alternatives-spray-foam-insulation.html
http://www.ecobuildingpulse.com/insulation/natural-resistance.aspx