[PaulRyansew]

Compressed air

http://www.theaircar.com/acf/

[Britiobby]

What would the effect be of hundreds of thousands of cars in an urban area spewing water vapour into the air? It's known that water vapour is a very effective greenhouse gas. I doubt that it would make it high enough into the atmosphere to have much of an effect this way, but wouldn't it tend to produce bigger clouds and therefore more rain downwind from the cities?

The water already has to come from somewhere. The problematic step with using petroleum (and coal) as fuel isn't burning it in cars, it's extracting it from the ground. That represents taking carbon that was sequestered outside the normal carbon cycle, and reintroducing it into said cycle. One part of that cycle is CO2 in the atmosphere - so by increasing to total amount of carbon in the cycle, you increase the amount of CO2 in the atmosphere.

Hydrogen fuel cells would presumably take hydrogen from water, so it's not increasing the total amount of water in the water cycle.

[Elaltergephah]

Well, I'm buying umbrella stocks in the morning.

Thanks!

[Druspills]

Most likely future cars will be electric. The focus will be on the supply end, as well as engine performance.

[gueremaisse]

Originally posted by Theben
Most likely future cars will be electric. The focus will be on the supply end, as well as engine performance. Um, hydrogen fuel-cell powered cars are electric. A fuel cell is just an exotic battery.

[Lafclaria]

Originally posted by Kuciwalker

Um, hydrogen fuel-cell powered cars are electric. A fuel cell is just an exotic battery. Whoops. That's what happens when you skim.

[SimSlim]

Originally posted by LotC


Please keep your facts out of my unpleasant future scenario.

Let's say for the sake of doom that we harness the power of cow farts to make the hydrogen.

If anyone is going to sh!t in this thread it's me. *splurchhhh* Said like a good prairie boy.

[accelieda]

But if you do that, where will you use for Lebensraum?