Earth Day Inspired: Incredible Green Homes

With Earth Day just around the corner (April 22, to be exact), now is the perfect time to showcase some of the world's most audacious green homes. From the plastic-bottle home of Puerto Iguazu, Argentina, to the stunning Frank Lloyd Wright-inspired prefabricated homes right here in California, green design has come a long way since polyurethane mud huts. After the jump, explore the radical directions that some of the world's leading architects are driving sustainable living.