Again...these ideas are being picked up by many of us. After learning about Earthships, I came to the conclusion pretty quickly that by submerging any structure, whether for humans, plants, livestock, or a combo of these.. INTO THE MOTHER EARTH, we are protected within her embrace from the ups and downs of the ever-changing and sometimes brutal weather.
By submerging our structures into the Earth, we are snuggling ourselves in with superior insulation and creating a little womb of warmth in the winter months. I will definitely be doing this, at first for a new greenhouse that will support two Paw-Paw trees, then a small chicken-quail-duck home on the east side of the dome, and then eventually a 40ft diameter circle human home with walls 2-3 ft thick and big southern facing windows to be able to grow tropical fruit trees in the painfully cold winter weather of Central Minnesota.
Imagine the picture above with a pure glass ceiling. Even a raised hoop ceiling or an A-frame. Making sure there is enough head-room for two vigorous paw-paw trees that will need their space in 5 years.