hydrogen for actual fuel

im talking about not a fuel cell,but having a high pressure tank to hold the hydrogen,change the lines tweek the injectors and program the ecu,and using the engines that already produced to burn the hydrogen,making the hydrogen is way cheaper than creating gas or diesel from oil,lower impact on the environment the world is 75% water and when we burn it ,changes back into water so now it doesnt have a carbon footprint. there dependemcy on oil solved ,now all we have to do is get the oil giants to let go like the wagon makers had to let go when the automobile was introduced to the world.