Eutrophication and warming are changing how lakes work, affecting carbon dioxide levels. In Lake Taihu, China, high nutrient levels from pollution make CO2 levels change over decades. Nutrients from rivers make CO2 levels peak at river mouths. Warmer temperatures in summer lower CO2 levels by boosting plant growth. The study looked at 24 years of data and found that eutrophication and warming can change CO2 levels in lakes over time. Future research should focus on how warming and eutrophication together affect CO2 emissions.