As the world transitions toward sustainable energy, green hydrogen emerges as a critical energy carrier due to its environmental benefits and compatibility with renewable energy sources. This study presents a Life-Cycle Assessment (LCA) of green hydrogen production using water splitting technology integrated with a poly-generation cycle, which enables simultaneous production of hydrogen and other utilities. By using solar energy to power Proton Exchange Membrane (PEM) electrolyzer, the study assesses both the environmental impact and energy efficiency of the proposed setup. Emphasis is placed on the Global Warming Potential (GWP), which offers insight into carbon emissions across the life-cycle stages. The integration of the poly-generation cycle with water splitting technology is analyzed to determine its potential in reducing environmental impact and enhancing resource utilization efficiency. Results suggest that this approach could significantly lower GWP while optimizing energy input, making it a viable path toward more sustainable hydrogen production. The findings hold promise for advancing green hydrogen production technology in alignment with global decarbonization goal.