Strawbale/Cobb, Dome, Earth sheltered home - traditional Cape Cod?

I would have to be the earth sheltered home for environmental reasons. It would be so much easier to heat and cool and save the resources. Plus, I think they look neat.

I've always wanted an earth sheltered home. The temperature pretty much stays a constant around 50 degrees F. making it much easier to heat in the winter and keep cool in the summer. You don't get the drafts that a normal house does. I live in a cape cod style home that was built in the mid 1800's, which is hard to heat, hard to cool, and is draftier than blue blazes lol. When I was married we had planned on building an earth sheltered home, only one floor would have shown above ground, and two different levels below. It was designed so that you really couldn't tell it was an earth sheltered home from the outside; outside it only looked like a ranch home. Unfortunately it never got built because we divorced.