Because hydrogen is a real pain in the ass to store/transport since it needs to be kept under extremely high pressure or very low temperature. That said, you c

Because hydrogen is a real pain in the ass to store/transport since it needs to be kept under extremely high pressure or very low temperature. That said, you can take hydrogen and some carbon and make hydrocarbon / long-chain hydrocarbon molecules (e.g. gasoline, diesel, methane, etc.), which we already have infrastructure in place to move, store, and use. I'm not sure why nobody takes synthetic generation of hydrocarbons seriously. It's carbon-neutral, and seems like it would be a pretty good stop-gap until we figure out better storage of electric charge.