Hydrogen, a versatile energy source, can be produced through various methods, each impacting the climate differently. Green hydrogen, generated from renewable energy, is climate-neutral, while gray hydrogen from fossil fuels is not. Future hydrogen production could reach 3,000 to 5,000 gigawatts by 2050, primarily from solar energy, necessitating extensive infrastructure for production, storage, and transportation. Hydrogen has potential applications in CO₂-intensive industries, heavy transport, and as a seasonal energy buffer, while also leveraging existing natural gas pipelines.