Thisss! You don’t need to invent some crazy futuristic material when humans have been building sustainably for millenia. All you have to do is look into: 1. what material is avaible in the area? and 2. what enviromental factors do you need to take into account? If you’re building in a hot area, the house needs to be able to stay cool. If you’re building in a cold area, the house needs to be able to stay warm.