The global energy sector is transitioning towards decarbonization and energy security, emphasizing the importance of natural gas and hydrogen. By blending hydrogen with natural gas, existing infrastructure can be utilized to lower emissions without compromising energy reliability. Worldwide initiatives like the NaturalHy project in Europe and projects in the UK and China are exploring the integration of hydrogen into gas pipelines, showcasing the potential to reduce transport costs and carbon footprint. However, challenges such as hydrogen embrittlement in pipeline materials require thorough research. Studies on the impact of hydrogen on pipeline steels reveal the need for a deeper understanding of material reliability under varying conditions. Despite these challenges, the economic benefits and reduced carbon emissions gained from hydrogen integration make it a promising energy solution for the future.