Gnanli Landrow has developed a special powder that can turn soil and water into a solid building material. Inspired by the homes he grew up in in West Africa.
It has less carbon footprint than concrete, and it is being prepared for use in a new residential block.
Learn more about People who make the world podcast.
Developed by Richard Kenny and Jo Mathys. Filmed by Angus MacKenzie. Correspondent: Myra Anubi