Again, there are a couple of pathways to hydrogen. Actually, there are several. The two principal ones present different sorts of challenges. If you're using electricity through electrolysis—separating water—then you need a sufficient energy supply in order for that to happen. Similarly, in the conversion of natural gas, you need to think about how energy is supplied in order to create the heat that would generate the separation of the molecules.
Those are things that then become relevant as we think about some of the challenges of electrification and some of the technologies that are available there.