If you're climate-conscious, you might be interested to know that conventional cement production accounts for a massive chunk of annual global carbon dioxide emissions. Concrete and cement have been the standard for building houses and skyscrapers for decades, but the energy required to produce cement, especially for firing limestone in kilns, results in a massive environmental impact. There's an alternative right under our noses, though. Researchers in Australia have introduced a new building option called cardboard-confined rammed earth, a material made from just soil, water, and recycled ca