In high school, we learn that hydrogen is a colourless gas, so what is green hydrogen?
— Brown hydrogen is produced using coal where the emissions are released to the air.
— Grey hydrogen is produced from natural gas where the associated emissions are released to the air.
— Blue hydrogen is produced from natural gas, where the emissions are captured using carbon capture and storage.
— Green hydrogen is produced from electrolysis powered by renewable electricity.
Abundant, cheap and clean-burning, hydrogen has long been described as the fuel of the future. That future has never quite materialised, however, due to hydrogen’s disadvantages. It’s difficult to transport, it can make metal brittle and it’s 20 times more explosive than petrol.
But in recent years, “green hydrogen”
— hydrogen made without fossil....
