It is not "emissions free." NOTHING is emissions free. There is no free lunch. Consider how much "emissions" it took to produce the hydrogen in the first place.
I get a kick out of the tree huggers who drive electric cars, thinking they are "helping the environment" by driving a zero-emissions car. Horse-hockey. All they have done is move the emissions from their tailpipe to the smoke stack of whatever power plant serves them. They are still using energy and it takes some kind of emissions-producing fuel to make that energy.
