According to the National Research Council, a green roof (one covered with plants) minimizes heat flow into a building and can reduce the summer energy demands (i.e. air conditioning) by up to 75 percent.

I stole this quote from Jim Holes Gardening newsletter; his newsletter is a constant source of inspiration for me and Jim is responsible for my excitement about “Woolly Pockets.” You would assume this product would probably serve to keep your hands warm…not even close. “Woolly Pockets” allow you to grow vertically…yes indeed; I am talking about green walls. Made out of recycled pop bottles these growing pouches feel like soft felt. They also feature a watering tongue that wicks water down to the roots of your plants, a moisture barrier that prevents leakage, and breathable material that allows excess moisture to evaporate. The units are modular and can be used horizontally or vertically and both inside and outside.

Plant material is up to you; you can plant a woolly pocket full of tropical plants...