Hydrogen is the most abundant of the chemical elements. The abundance of hydrogen is roughly 75%. Stars in the main sequence are mainly composed of hydrogen in its plasma state. However, there are less hydrogen on Earth. Therefore, hydrogen is industrially produced from hydrocarbons (e.g. methane). We use elemental hydrogen locally at the production site. The largest markets almost equally divided between fossil fuel upgrading, such as hydrocracking, and ammonia production, mostly for the fertilizer market. Hydrogen may be produced from water using the process of electrolysis, but this process is significantly more expensive commercially than hydrogen production from natural gas.