It's not a fossil fuel byproduct. It's a fossil fuel product. You take natural gas, split it in a process called steam reforming, you get hydrogen and CO2 emis

It's not a fossil fuel byproduct. It's a fossil fuel product. You take natural gas, split it in a process called steam reforming, you get hydrogen and CO2 emissions. Green hydrogen only exists in very small quantities these days and for many years to come it'll be needed to first replace existing natural gas based hydrogen and to decarbonize industries like steel. There's basically a consensus among energy experts these days that hydrogen in cars is a dead end.