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In this paper, we demonstrate a means of simultaneously solving two serious environmental issues by reutilization of calcinated mixture of pulverized waste oyster shells blending with poly(methyl methacrylate) (PMMA) nanospheres to prepare CaO-based sorbents for CO₂ capture. After 10 cycles of isothermal carbonation/calcination at 750 °C, the greatest CO₂ uptake (0.19 g CO₂/g sorbent) was that for the sorbent featuring 70 wt% of PMMA, which was almost three times higher than that (0.07 g CO₂/g sorbent) of untreated waste oyster shell. The greater CO₂ uptake was likely a result of particle size reduction and afterwards surface basicity enhancement and an increase in the volume of mesopores and macropores. Following simplified life cycle assessment, whose all input values were collected from our experimental results, suggested that a significant CO₂ emission reduction along with lesser human health …