That's what I'm talking about.

68º year round because it's built deep enough into the ground to take advantage of the constant temperature at that depth. 68º is easy to live in anytime of year.

If you hook that up to solar, wind or micro-hydro, get some high efficiency appliances, set up a rain catchment system and so on, you're ready for just about anything.

Awesome!
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"Learn survival skills when your life doesn't depend on it."