Have you ever looked at tail pipe of car in freezing weather? Most of that is water vapor. Some fraction is particulate emissions, but most of it is vapor. Most

Have you ever looked at tail pipe of car in freezing weather? Most of that is water vapor. Some fraction is particulate emissions, but most of it is vapor. Mostly don't see this in summer. But cars have been for century produced water as exhaust with no issues. Water from hydrogen is really not that different.