As an element, hydrogen is the simplest and the most plentiful, but it must be derived from other substances like water, coal, biomass, and natural gas. It is not found as a gas in nature. Currently 95% of hydrogen is obtained from natural gas (a fossil fuel) through a steam reformation process that releases carbon dioxide (a greenhouse gas) into the atmosphere. The use of dirty fossil fuels to produce hydrogen, a clean energy, only redistributes pollution concerns. One hydrogen gas molecule (H2) contains two hydrogen atoms. Each hydrogen atom contains one negatively charged electron (e-) and one positively charged hydrogen proton (H+).