Cyanobacteria, otherwise known as “blue-green algae”, commonly obtain their energy from oxygenic photosynthesis. This means they convert sunlight into chemical energy, splitting water to liberate oxygen and fixing carbon dioxide into sugar. Cyanetics Ltd, an innovative biotechnology company based in Stevenage, UK, exploits this process to manufacture “products from pollution” – by converting carbon dioxide into chemicals useful for industry. Our proof of concept project, funded by UK Research and Innovation (UKRI), is a collaboration with The University of Nottingham and involves synthesis of citric acid from modified cyanobacteria. The naturally-produced citric acid will be used in industry to recycle lead-acid battery paste via our innovative technology, FenixPb.