Don’t we have to burn both to produce energy/electricity?
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Semantics.
Stricly speaking in physics, there is no such thing as an energy sorce, since energy can’t be created or list, just changed from one form to another. So petroleum is, strictly speaking, an energy bearer as well, even though you’ll probably still find it referred to as an energy source all the time among physicists as well.
I think the other commenters have it right. It’s got to do with our perspective on it. Hydrogen is a bit like a battery, we need to put the energy into it from somewhere, and we can than use it when needed for energy. Hence, we call it an energy bearer. Petroleum, we can dig up and burn, so it’s an energy source to us.
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