The Ghanian start-up Theseus Development produces an alternative material to cement-based concrete for the construction industry called "geopolymer". Not only is the material produced from the mineral that occurs in great abundance in the earth's crust as well as industrial waste, but the production process does not emit carbon dioxide either. The material has very low thermal conductivity, so buildings created with this material are naturally thermally efficient. Furthermore, the material is highly durable and resilient. These qualities prove geopolymers to be a greener solution than cement-based concrete, increasing accessibility to building materials and contributing to a circular economy approach.