Hydrogen is the simplest chemical element, the first in the periodic table with atomic number 1. It is also lightweight, can be stored and generates no pollutant emissions of its own.
What it is not, is green. Neither green, nor any colour. Its name comes from its method of production, given that it is an element that rarely appears in nature on its own, having to be separated from other elements by a process called electrolysis. Green hydrogen is therefore hydrogen obtained through the use of renewable energies in its production, which makes it a clean, sustainable fuel with a zero pollution index that can be key not only as an energy vector, but also as a raw material.