Currently the cheapest way to obtain hydrogen is by extracting it from petroleum products, the process releasing carbon dioxide and other byproducts.
Ultimately you'll get less useful energy out of it than if you just used the fossil fuels outright.

Hydrogen is already somewhat expensive compared to other fuel sources, so getting most buisesses to obtain it in environmentally friendly ways would be a challenge.

There's also the issue of storage. Gaseous hydrogen requires large pressurized storage tanks, and ends up being less energy dense in terms of volume than other fossil fuels. Liquid hydrogen of course can be much more energy dense, but requires a lot of energy to cool it to the point where it becomes a liquid state, and further cooling to keep it there.

Although liquid hydrogen has its use as a specialized high energy density fuel, at the current moment, I don't see hydrogen as an economicaly viable fuel.