Hydrogen could possibly be the next big thing in energy but do you know what it actually is? And why have the discussions around a colourless gas involved so many colours? In this episode of News glossary, Matilda Boseley gives us a rundown of what hydrogen energy is and what the difference between all the colours are. And before you ask, yes, there really is pink hydrogen and turquoise hydrogen. Pink hydrogen is generated through electrolysis powered by nuclear energy, and turquoise hydrogen is made using a process called methane pyrolysis.