Gas hydrates have served as the focal point of research from a sustainable engineering perspective due to their specific applications in diverse scientific areas, including natural gas storage and transportation, gas separation, water purification, carbon capture, and sequestration (CCS). Improved carbon dioxide (CO2) hydrate formation kinetics will render the development of technologies for CCS. Low temperature and high pressure prevail under the seafloor, making the sequestration of gaseous CO2 in solid hydrates plausible. On the contrary, the formation of gas hydrates causes a severe problem in the production, transportation, and processing of hydrocarbons in offshore petroleum industries. They are prone to form inside subsea and above-ground pipelines, prohibiting the flow of oil and gas and often leading to complete blockage. This gives rise to operational problems, equipment damages, safety concerns, and economic losses. While many hydrate inhibitors have been identified to maintain flow assurance, the effects of alkalis, like NaOH and Ca(OH)2, on phase stability and growth kinetics of methane hydrate have not been explored in detail. This research investigates the phase behaviour and growth of methane hydrate in the presence of aqueous solutions of NaOH and Ca(OH)2 with varying concentrations in a stirred tank reactor. Both the alkalis have been found to exhibit thermodynamic inhibition of methane hydrate formation, and the inhibition effect becomes more pronounced at higher concentrations of the alkalis, with NaOH performing as a better inhibitor than Ca(OH)2. Methane uptake by the hydrate with NaOH decreased with increasing concentration. About 30% rise in the final gas uptake was observed with the alkalis at 0.1 wt%, while 23% drop in the same was noticed with 4 wt% NaOH. Moreover, t90 was 2.5 and 2.6 times of pure water with 2 wt% of NaOH and Ca(OH)2, respectively. The phase stability and gas uptakes by the methane hydrate with these alkalis were also predicted using thermodynamic and kinetic models. This research also presents the formation and dissociation kinetics of CO2 hydrates in the presence of aqueous solutions of three CO2-philic additives, namely, acetamide, 1,2,4-triazole, and non-ionic surfactant 1-dodecyl-2-pyrrolidinone (DDP) with varying concentrations in a stirred tank reactor. Due to their strong interactions with CO2 molecules, these chemicals, which have high binding energies with CO2, can promote CO2 hydrate formation by drawing the dissolved CO2 molecules towards the hydrate cages. All the additives exhibited considerable improvements in gas uptake compared to pure water, with 0.5 wt% DDP showing the most substantial promoting effect as it increased the moles of CO2 uptake and water-to-hydrate conversion by 54%. Furthermore, a reduction of 80% was observed in t90 with 0.5 wt% of DDP. The dissociation studies on the CO2 hydrates demonstrated high dissociation rates, thus, faster CO2 recovery for further use.