15. Decatur, GA: Butterfly Roof (2008)

Today, host Steve Thomas discovers how dirt gets up to a green roof. Then, two geologists from North Hampton, MA turn to the earth and sun for all of their energy needs. Later, a new kind of siding called paulownia, a childproof mud wall, is explored and the finer points of selling a green house are discussed.

Release date: 2008-10-23