Japanese car manufacturer, Mazda and Hiroshima University have been working on lower CO2 fuels since 2015. A key area of focus has been on the DNA a specific seaweed (Nannochloropsis oceanica). This algae grows rapidly and produces a high concentration of lipids (fats) which make it perfect for biodiesel - which can be used in most combustion engines.
https://carbuzz.com/news/mazda-to-keep-the-combustion-miata-dream-alive-by-making-fuel-from-seaweed