To develop the crucial concepts of clathrate hydrates toward the hydrate-based technological implications, it is indispensable to comprehend their formation and growth mechanisms and stability in pure and saline water environments. In this view, we provide fundamental insights into the gas hydrate dynamics by carefully conducting a molecular dynamics simulation in an extensive range of carbon dioxide (CO₂) gas (CO₂/H₂O from 1:5 to 1:18) and sodium chloride (NaCl) salt (from 0.0 to 18.0 wt %) concentrations. Using the F_4φ order parameter and the radial distribution function, we assess the important information about the time evolution of the visualization states and the formation and growth of small (5¹²) and large (5¹²6² and 5¹²6⁴) cages of hydrates along with their crystalline nature. We found that (1) CO₂ forms the pure S–I type of hydrate structure irrespective of guest gas and salt concentrations; (2) lower CO₂ gas concentration (CO₂/H₂O from 1:8 to 1:18) leads to fast but incomplete conversion of water to hydrate, while the higher CO₂ gas concentration (1:6) causes the phase separation and consequent sluggish hydrate growth; (3) 1:7 is an optimum CO₂/H₂O ratio for the rapid, complete, and properly ordered hydrate growth; (4) at the optimum amount of CO₂ and H₂O, the lower range of salt concentrations (0.0–5.0 wt %) has a slight inhibition effect on the hydrate growth, while there is a notable inhibition effect for the higher salt concentrations (7.0–18.0 wt %); (5) the number of oxygen atoms of water present in the first coordination sphere remains constant for the lower salt concentrations (0.0–5.0 wt %), and they get reduced with the higher salt concentrations (7.0–18.0 wt %); (6) the inhibition effect is due to the reduction of CO₂ solubility in the aqueous phase in the presence of salt ions. These novel findings provide useful assistance for choosing an appropriate combination of the imperative elements of gas hydrate systems toward carbon dioxide separation, sequestration, storage, and transportation.