In addition to Mixon's criticisms, there is always the issue of alpha radiation. All earth material tends to have some alpha radiation emitters (often more simply and misleadingly called radon). The more surfaces one has that are earth material (dirt, limestone, concrete), the more fresh air ventilation one needs to have healthy air.
Is caving dangerous because of alpha radiation? In very few caves is it, because none of us spends that much time in caves. There are some western caves with some incredibly high alpha counts. Is mining dangerous because of the 40-hour work week exposure. No, because mines are ventilated with fresh air and the air quality is monitored. Is living underground without a lot of fresh air ventilation or even cooling your home or business with cave air a health hazard? Yes. Wait a minute, alpha radiation can't even penetrate your skin, so this is all BS. No, because the vector is from breathing in particles that are alpha emitters. Breathing in alpha emitters tends to produce lung cancer. High humidity promotes mold growth and overexposure to mold can cause other lung problems (personal experience and a visit to a pulmonologist). If such a home had any appliances, there would be waste heat that would help (enough for the summertime??) decrease the relative humidity. Natural thermal attenuation and moderation are wonderful things and this email should not be construed to say that they are not worth pursuing. However as with most things in life, the devil is in the details. Philip L. Moss philipm...@juno.com ____________________________________________________________ Compete with the big boys. Click here to find products to benefit your business. http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTI97yP6P6YksmwUM1feXU7RurNtHLsWgBMdd3sgzhr9RKzpzgVcDe/
