Hydrogen is often touted as a green and nearly inexhaustible source of clean energy. The first element of the periodic table burns completely clean, leaving nothing behind but water vapor. This makes it extremely enticing and sellable as a fuel source option for a decarbonized future economy. However, the reality is much more complex and much less green. Hydrogen power is nothing new, and is already used in industrial processes such as ammonia production, in refineries and as a feedstock for chemicals. This hydrogen, however, like most hydrogen currently in production, is created through the use of fossil fuels, primarily coal and natural gas. This hydrogen is known as “grey hydrogen” and is useless when it comes to reducing greenhouse gas emissions.