Architizer is the largest platform for architecture and design online. They recently celebrated earth day with some great examples of an eco friendly construction method, rammed earth.

“As an eco-friendly alternative to concrete, rammed earth has been trending for a minute; suffice it to say that the sustainable and cost-effective building solution has come a long way from ancient times. By using natural and usually local materials like sand, soil, clay, chalk, lime, or gravel, compressed into blocks, rammed earth buildings have low embodied energy and produce little waste. Moreover, the composite material is attractive as a means of passive climate control — and, if these projects are any indication, aesthetically, as well.”

More info at Get Down to Earth: 6 Examples of an Eco-Friendly Construction Method. Whilst there you can find more information and great images on rammed earth  at this link –  Rammed Earth: Sustainable Design’s Eco-Chic Flower Child.