Rammed earth houses are supposed to be good insulated houses.
So, I’m not sure if that’s a good reason. You can fill the inside of the blocks with insulating material or the inside side of the blocks.
I’m just curious, that’s all. I’m not that environmentally friendly. :)
They use cinderblocks instead of concrete blocks because of the weight. Foundation structure gets harder with solid or hollow concrete blocks. Cinder blocks require sealing also, as do hollow concrete blocks.
Now stabilized adobe is a good building material in a dry climate. 3’-4’ thick walls work well for that.
Rammed earth homes provide good thermal characteristics in high cooling degree day climates. Low mass homes Sips, some ICFs and super insulated homes are for high heating degree day climates.