The idea of an (Walipini) underground greenhouse "was developed in South American to help the impoverished people there grow their own food year round by taking advantage of the more constant temperature of the ground." The PDF at the link details the construction of one. I wonder if these may be of benifit to those living in colder climates as well for the same reason?
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How to build an underground green house - Walipini
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Re: How to build an undergorund green house - Walipini
Interesting concept.
It may work well in areas close the equator where the sun is always overhead, but in northern latitudes, the sun is so low in the winter that you couldn't utilize solar heating with this design. However, doing something similar, but building into the side of a south-facing slope might utilize some of the same advantages.
."The next major advancement in the health of American people will be determined by what the individual is willing to do for himself"-- John Knowles, Former President of the Rockefeller Foundation
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