Just northwest of Taos, N.M., a small community is a showcase for one of the most interesting types of sustainable housing in the world. Known as earthships, the buildings are off-the-grid, and are made of natural and recycled materials. And they are known for maintaining a steady, comfortable interior temperature year-round, regardless of how hot or cold it is outside. Plus, residents can survive on as little as nine inches of rain a year, thanks to the ingenious water recycling design. CNET's Daniel Terdiman visited the Earthship World Community during Road Trip 2007.