Pros and Cons of Using Hydrogen Fuel? Advandages Hydrogen gives off roughly 2.5 times more energy than the equivelant reaction for Methane, so it's an attractive source of energy. Hydrogen is friendly to the environment because its only waste product is water.  The following table of common Hydrocarbons (fossil fuels) demonstrates that Hydrogen can be extracted using current refining processes. 4       Common Hydrocarbons C2H6 Ethane C3H8 Propane C4H10 Butane C5H12 Pentane C6H14 Hexane C7H16 Heptane C8H18 Octane Taken from Chemistry 6th Edition 5 In the future, Hydrogen will be extracted from water. 6 For more information regarding the following processes, visit the following website: http://www1.eere.energy.gov/hydrogenandfuelcells/pdfs/doe_h2_production.pdf Natural Gas Reforming Renewable Electrolysis Gasification Renewable Liquid Reforming Nuclear High-Temperature Reforming High-Temperature Thermochemical Watter-Splitting Photobiological and Photoelectrochemical Disadvantages Current extraction processes are expensive. 4 Producing safe Hydrogen supplies requires the use of an elaborate filter known as a Hydrogen purifier.  1