Interested in building your own underground greenhouse? Here are 5 things you should know…This low-tech technology is a true gift from mother nature.For as little as $300 you can create an underground greenhouse that will provide enough food to live on year-round.A walipini, meaning “place of warmth” from the Amaraya Indian language, is an underground greenhouse with a transparent (usually plastic) covering that stays warm by passively soaking up the sun’s heat and absorbing the earth’s ther...
