Hydrogen is often considered a form of green energy, mainly due to its clean energy use. When used in a fuel cell, hydrogen reacts with oxygen in the air to produce electricity and emits water vapour. This reaction does not generate greenhouse gas emissions or atmospheric pollutants.
Hydrogen can be considered a green energy source when it is produced using renewable energy sources such as solar, wind or hydroelectricity. It is considered green because it does not contribute directly to greenhouse gas emissions. It is therefore known as "green hydrogen".