Engineers at RMIT University have developed cardboard-confined rammed earth, a building material made from cardboard, soil and water. It has roughly a quarter of the carbon footprint of concrete and is fully reusable and recyclable. “By simply using cardboard, soil and water, we can make walls robust enough to support low-rise buildings,” lead author Dr Jiaming Ma says. “This innovation could revolutionise building design and construction, using locally sourced materials that are easier...