Scientists are trying to make concrete stronger and more sustainable by adding coffee grounds to the mix. Initial results are promising, but questions about scale remain.
A climate-friendly cement received the first third-party certification that it is structurally and chemically the same as the conventionally produced stuff.
The traditional building material is cooler, cheaper, and requires less energy to make. But convincing villagers in Burkina Faso to stick with mud isn't easy.
