Hydrogen
Hydrogen is the most abundant element on earth but it rarely exists alone, therefore Hydrogen (H2) is produced by extracting it from its compound
Hydrogen can be produced in numerous ways. Some methods produce CO2 while others are carbon free
H2 can be renewable or decarbonized if produced using renewable or carbon free electricity
Hydrogen has the highest energy content of any common fuel by weight
Hydrogen is a high efficiency, low polluting fuel that can be used for transportation, heating, and power generation in places where it is difficult to use electricity or as a CO2 neutral feedstock for chemical processes (ammonia-fertilizers
“I believe that water will one day be employed as fuel,
that hydrogen and oxygen which constitute it, used singly or together, will
furnish an inexhaustible source of heat and light, of an intensity of which
coal is not capable”.
Jules Verne, "The mysterious island"
Jules Verne referred to hydrogen already in 1874 and although he is known for his exceptional “science fiction” writing, he expressed something that 112 years after his death would become reality.