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The continuous accumulation of carbon dioxide (CO2) in the atmosphere represents one of the greatest challenges to achieving a sustainable and circular carbon economy. Traditional capture technologies based on aqueous amines are effective but suffer from high energy penalties, corrosion, and environmental toxicity. In contrast, bio-based polymers offer renewable, low-impact alternatives for CO2 capture and subsequent transformation. Chitin and its deacetylated derivative chitosan emerge as particularly promising d...