An earth shelter is a structure (usually a house) with earth (soil) against the walls, on the roof, or that is entirely buried underground.
An earth sheltered house in Switzerland (Peter Vetsch)
Earth acts as thermal mass, making it easier to maintain a steady indoor air temperature and therefore reduces energy costs for heating or cooling.
Earth sheltering became relatively popular after the mid 1970s, especially among environmentalists. However, the practice has been around for nearly as long as humans have been constructing their own shelters.
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