Here's why:

* Steam Methane Reforming (SMR): This is the most common method for producing hydrogen. Natural gas (primarily methane) reacts with steam at high temperatures and pressures in the presence of a catalyst to produce hydrogen and carbon dioxide.

* Other Sources: While natural gas is the dominant source, hydrogen can also be obtained from:

* Coal gasification: Coal reacts with steam and oxygen to produce syngas (a mixture of carbon monoxide and hydrogen).

* Electrolysis of water: This process uses electricity to split water into hydrogen and oxygen. This is becoming more prevalent as renewable energy sources become more readily available.

Let me know if you'd like to know more about any of these methods!