An underground greenhouse — commonly known as a walipini, a word meaning "place of warmth" in the Aymara language — is one of the most effective ways to grow food year-round by working with nature instead of against it. Rather than battling freezing winters, harsh winds, or extreme temperature swings, a walipini uses the earth itself as insulation. By building below ground … [Read more...] about How and Why to Build an Underground Greenhouse (Walipini)