In the study, scientists looked into using CO2 to help break down cellulose (found in plants) into useful substances in hot water. They used cotton as a model for cellulose. The results showed that CO2 can speed up the breakdown of cellulose efficiently. When CO2 was used, the cellulose became softer at higher temperatures. The researchers found that crystalized cellulose could break down with CO2 present. Most of the breakdown happened in areas where the cellulose wasn't crystalized. They tested how temperature, pressure, and time affected the cellulose breakdown process.