This system, as with all green roofs, provides a natural cooling effect as well as excellent thermal insulation for a building. Green roofs can also remove carbon dioxide from the air and supply oxygen, and are an excellent addition to any flat-roofed building. The TM9 turf mat is an easy way to add a green roof to almost any building. http://www.greengeek.ca/2006/08/30/green-roofs-made-easy