Tejas Sidnal, an architect, used to think about building carbon-negative homes, structures that absorb more Carbon dioxide than they emit. A concept which has started taking off in the West slowly, it is still far from reality in India. Sidnal realised that it is impossible to build a carbon negative house if you don’t have carbon negative products and construction materials in the first place. This was the beginning of CarbonCraft, a start-up which aims to convert carbon emissions into building materials…