Fourth generation biofuel feedstocks, as described by the Biopact website (URL above), are crops that have been modified or processed to improve not only the biofuel conversion process, but also to impart a capability for “Carbon Capture and Storage” (CCS). These biofuel feedstocks are often considered “carbon negative”, meaning that the carbon dioxide absorbed during cultivation is higher than the carbon dioxide given off during its processing and use as biofuels. Imparting the capability for carbon dioxide capture can focus on modifying the plant (by molecular biology techniques) or by attaching additional processing steps during the production phase, to physically or chemically capture the carbon dioxide. When the latter is done, the captured CO2 goes to ultimate disposal, through deep burial in geological formations (“geosequestration”) or by other means. A recent study by researchers from the University of Essex (United Kingdom) provided new knowledge in the regulation of carbon dioxide fixation (the “carbon capture”) in plants. Details of the research are published in the Proceedings of the National Academy of Sciences (PNAS) (URL above). The results can open new strategies to increase the amount of carbon dioxide absorbed by the plants and hence, higher food or biofuel production yields. .