The European Space Agency (ESA) and France’s space agency CNES are leading the way in advancing green hydrogen production for the Ariane 6 rocket through Project Hyguane. Currently, the rocket uses hydrogen produced via steam reforming of methanol, which generates greenhouse gases. To address this, the agencies are transitioning to solar-powered electrolysis of water, significantly reducing CO2 emissions. This shift aligns with global sustainability goals and aims to supply 12% of the hydrogen required for Ariane 6 launches annually, leading to a substantial reduction in CO2 emissions. Project Hyguane involves a collaboration between ESA, CNES, Air Liquide, SARA, MT-Aerospace, BEBLUE, and several academic institutions, with funding support from the French government. The initiative not only focuses on space exploration but also extends to using hydrogen to power low-carbon vehicles and electricity generators in French Guiana. This move towards hydrogen transportation aims to provide a cleaner alternative to diesel engines and bolster local sustainability efforts. The project's outlook is optimistic, with plans to potentially double hydrogen production to meet increasing demand. This expansion could involve supplying hydrogen for buses and trucks, further enhancing the local economy and reducing CO2 emissions. Through initiatives like Project Hyguane, significant strides are being made towards promoting green hydrogen for space exploration and various terrestrial applications, setting the stage for a cleaner, sustainable future.