One clear application of this potential fuel is already in use in several countries, one of which being Japan. Being more specific, hydrogen fuel cells are beginning to gain notoriety in the transportation industry which constitutes 28% of the world's CO2 emissions.  Today, Japanese companies such as Toyota are increasingly looking at hydrogen fuel celled cars in the future. However, a more current use of hydrogen can be seen in the Japanese Bus system. As of today there are 80 active hydrogen busses circulating throughout Japan, with many more in active production. The benefits of taking public transportation combined with zero-emission constitutes a great deal of praise and future promise. 

That being said, there are clear underlying issues with hydrogen. First and foremost is the immense cost that comes with developing new technology and applying it our current systems. As it is today, hydrogen fuel cells simply cannot compete, in terms of energy density, with more traditional forms of fuel, mainly fossil. The disparity is much too large at the given state and some question if hydrogen is worth the money. Though the Japanese government has subsidized the creation of more hydrogen busses from Toyota, it still isn't enough. Furthermore, the greater accessibility to traditional fuels is an apparent issue. 

The world needs new forms of energy as we are running out of our old ones. Not only are we depleting our finite supply we are also, simultaneously, damaging our environment. This cannot continue. Hydrogen Fuel Cells could very well be in each and every car, with specific improvements that would make them cost effective.