Hydrogen

Hydrogen offers a clean energy solution to parts of the economy that are difficult to decarbonise, including industrial processes, domestic and industrial heating and hard-to-electrify transport including heavy-duty vehicles, ships and aircraft where battery solutions are much less practical than they are for passenger cars.
Unfortunately, the majority of hydrogen is locked away as either hydrocarbons (in fossil fuels) or water.
Extracting the hydrogen from either of these sources takes energy, and a lot of it, but hydrogen is then emission-free at the point of use.
Hydrogen is usually found in gas form. It is the lightest element in the universe and the most abundant, making up 75% of all mass in the universe.

When hydrogen is exposed to oxygen, it instantly reacts generating explosive power and heat making this gas a huge potential as a source of fuel.  

- The way that hydrogen is produced or obtained is categorised by a colour coding system:
o Grey 
o Brown
o Turquoise
o Blue 
o Pink
o Green