Different types of hydrogen production are labelled by colour. “Grey” hydrogen is made from fossil fuels using steam reformation. It costs about $1 a kilogram.

Investor interest in the nascent sector has been intensifying, fueling optimism initially driven by research startups and ...

Atoms can combine in different numbers and in different ways to make ... If you don’t have enough of each color, each group can make its own color key for colors to represent hydrogen, oxygen, carbon, ...