Why is everyone talking about hydrogen? Hydrogen (H2) is the most abundant element in the universe. It also offers great opportunities in the case of the energy transition. The number of vehicles that run on hydrogen fuel will increase in the coming years. Whether hydrogen will also make its way into households is still a question. It remains a gas. We must first replace grey, blue and turquoise hydrogen with green hydrogen. By the way, the ‘green’ only means it’s sustainable: the element itself is completely colourless and odourless.