An Earthship is a style of architecture developed in the late 20th century to early 21st century by architect Michael Reynolds. Earthships are designed to behave as passive solar earth shelters made of both natural and upcycled materials such as earth-packed tires. Earthships may feature a variety of amenities and aesthetics, and are designed to withstand the extreme temperatures of a desert, managing to stay close to 70 °F (21 °C) regardless of outside weather conditions. Earthship communities were originally built in the desert of northern New Mexico, near the Rio Grande, and the style has spread to small pockets of communities around the globe, in some cases in spite of legal opposition to its construction and adoption. Reynolds developed the Earthship design after moving to New Mexico and completing his degree in architecture, intending them to be "off-the-grid-ready" homes, with minimal reliance on public utilities and fossil fuels. They are constructed to use available natural resources, especially energy from the sun and rain water. They are designed with thermal mass construction and natural cross-ventilation to regulate indoor temperature, and the designs are intentionally uncomplicated and mainly single-story, so that people with little building knowledge can construct them. They can be perceived as a realization of the utopia of autonomous housing and sustainable living. History Earthship architecture began development in the 1970s, when the architect Michael Reynolds set out to create a home that would fulfill three criteria. First, it would utilize sustainable architecture, and materials indigenous to the local area or recycled materials wherever possible. Second, it would rely on natural energy sources and be independent from the electrical grid. Third, it would be feasible for a person with no specialized construction skills to build. Eventually, Reynolds's vision was transformed into the common U-shaped earth-filled tire homes seen today. The name is based on the idea of a ship or a space ship, in order to allude to the home's ability to provide everything for their inhabitants to survive: shelter, power, waste management, water, and food. Construction and design Earthships are predicated upon the idea that there are six human needs which can be addressed through environmentally sustainable building design: Energy: Thermal and/or solar heating and cooling, solar and wind electricity Garbage management: Reuse and recycling built into construction and daily living Sewage treatment: Self-contained sewage treatment and water recycling Shelter: Building with natural and recycled materials Clean Water: