How is Hydrogen Produced?

Hydrogen

The simplest and lightest atom, the most abundant element in the universe.

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is the most abundant element in the natural world, but it is almost always combined with other elements, so it has to be isolated. The problem is that 95% of hydrogen is currently produced using processes that emit CO₂ and therefore contribute to

global warming

Global warming, also called planetary warming or climate change, is the rise in the average t...

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, including steam methane reforming and

charcoal

Charcoal is carbon produced by the pyrolysis of wood in the absence of oxygen. Made in kilns,...

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gasification. Water electrolysis separates hydrogen and oxygen atoms without generating any CO₂ emissions, but the process is expensive. Researchers are working on other sustainable methods using microorganisms and photoelectrochemical cells.