The concept of a "hydrogen economy" revolves around the idea of using hydrogen as a primary source of energy instead of fossil fuels. Synonyms for this term include "hydrogen-based economy," "hydrogen energy economy," and "hydrogen-powered society." Other related terms include "renewable hydrogen," "green hydrogen," and "clean hydrogen." These terms highlight the importance of using hydrogen as a clean and sustainable energy source and moving away from non-renewable fossil fuels. The development of an efficient and widespread hydrogen economy has the potential to significantly reduce carbon emissions and promote a more environmentally friendly energy system.