How can we use Hydrogen Fuel in the future. As we know that Hydrogen gas found in enormous amount in outer atmosphere and on Earth it can be derived from Water. Doesnt it wil additional pressure on the water reserviours?

(may be broke/outdated!)
How can we use Hydrogen Fuel in the future. As we know that Hydrogen gas found in enormous amount in outer atmosphere and on Earth it can be derived from Water. Doesnt it wil additional pressure on the water reserviours?