123 move towards hydrogen

It all started with FIRE!

Fuel: We - naked apes - started to burn Wood, Coal, Petroleum, Uranium to retrieve HEAT.

Energy Transformation: Steam Turbine, Internal Combustion Engine , Nuclear Reactor, Electric Generators...they all transform different types of energy (thermal, chemical, mechanical) from one to another by resulting Torque (A term added to auto industry by Top Gear Head - Jeremy Clarkson) and Electricity. 
Each transformation is subjected to energy loss.

All in all, BURNING has become basic human instinct.

Finite fuel resource & Green house gas are the main factors of Fossil Fuel Depletion & Global Warming. Quest for clean, renewable energy source "Renewable Energy" has lead to

researches on Wind Turbine, Solar Panel, Wave Turbine, Biomass...

BUT they are not readily available - no place on earth gives 24hours of direct sunlight or continuous wind blows.

Therefore, Clean, Safe, Renewable, Abundant Back Up Power's Required.

Fuel Cell: H2 + O2 = Electricity + H2O

Electrolysis: H20 = H2 + O2

New Fuel: H2  
75% of Universe’s Elemental Mass (abundant)

Clean, efficient burning (water vapor as by product, current technology up to 65% efficiency)

Lightest, smallest gaseous element (compression required for economic storage)

Flammable (safe storage required)

Exists in combinations (efficient production required)

Therefore, move to hydrogen era requires careful planning of hydrogen infrastructure (storage, refilling stations, safety regulations), down to earth applications of hydrogen, government subsidies and a little FAITH.