If you burn a greenhouse gas to create H2, and then X% of the H2 goes to waste through leakage, it's possible this process may contribute more to global warming

If you burn a greenhouse gas to create H2, and then X% of the H2 goes to waste through leakage, it's possible this process may contribute more to global warming than just transporting and burning the greenhouse gas itself, depending on X. If X is very large, you could argue that the leak of H2 does contribute to global warming.