http://earthship.com/pennsylvania

Earthships are one of the key factors to help Philadelphia become the leading city in the world for sustainable living. An example for the world to follow.

Earthships represent total independence from anything. From electrical grids going down, from water not working, from giant storms, from freezing weather. Earthships will withstand any natural disaster when conventional architecture and infrastructure is destroyed. The people will still have power, water, sewage and warmth when giant storms hit.