This would imply that switching to burning hydrogen instead of gasoline should involve finding out what pollution is increased and decreased from such a fuel in

This would imply that switching to burning hydrogen instead of gasoline should involve finding out what pollution is increased and decreased from such a fuel in transportation and shipping switch. I would imagine part of the perception problem is that when we can see pollution as in a natural fire to roast meat as oppose to burning some fuel source to form the fire in which we really do not physically see the pollution although it is there.