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Consequently, researchers focused on their development and application in fields such as sensing and bioimaging. One potential advantage of employing CDs is using organic waste as carbon precursors in their synthesis, providing a pathway for waste upcycling for a circular economy. However, waste\u2010based CDs often have low fluorescence quantum yields (QY<jats:sub>FL<\/jats:sub>), limiting their practical applications. So, there is a need for a well\u2010defined strategy to consistently produce waste\u2010based CDs with appreciable QY<jats:sub>FL<\/jats:sub>, irrespective of the starting waste material. Herein, we developed a fabrication strategy based on the hydrothermal treatment of waste materials, using citric acid as a co\u2010carbon precursor and ethylenediamine as N\u2010dopant. This strategy was tested with various materials, including corn stover, spent coffee grounds, cork powder, and sawdust. The results showed consistently appreciable QY<jats:sub>FL<\/jats:sub>, reaching up to ~40\u2009%. A Life Cycle Assessment (LCA) study demonstrated that producing these waste\u2010based CDs has lower environmental impacts compared to CDs made solely from commercial reagents. 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