Well... the burning of gasoline (or alcohol) also emits water vapor together with the CO2. And, for a given amount of energy generated, the burning of gasoline emits more water vapor than the burning of hydrogen.
The burning of hydrogen generates far more energy than gasoline, so less of it is needed to generate the same amount of energy, and so less water vapor is produced.
So, if this problem does not happens with normal cars, it also wont happen with hydrogen fueled cars.
Coelho Reviewed by Coelho on . The problem with hydrogen-fuled cars I used to be a major proponent on hydrogen-fuel techologies, and I kinda sorta still am. Hydrogen is an immensely powerful fuel source, it doesn't waste other essential resources like food (as with bio-fuel), and there's been some ingenious methods that have arrived lately, allowing us to extract the hydrogen energy at a considerably lower cost/energy output. Here's the problem though: hydrogen fuel proponents brag that the only emmisions are water coming out the tailpipe. The way I see Rating: 5