when you saturate the air with water vapor, it rains

Not until it hits a certain point ... think about what relative humidity means.

i guess what i'm getting at, is water vapor is water vapor... whether it comes naturally or via an electric car. i dont see how water vapor from a car would affect the atmosphere any differently.

Go back to what Chuck was saying .... what would the effects of global warming be if EVERYONE was driving a hydrogen car?

Water vapor is water vapor yes, however you're essentially emitting it en-masse to the atmosphere AS A VAPOR wheras the vast amount of water vapor being emitted before everyone ran a vehicle on gas was astronomically less.

It's another one of those "Duh" things that the idiot greenies don't seem to understand ... Let's say for moment that Co2 does trap heat and cause the near-earth atmosphere to heat up, if the atmosphere reaches %100 relative humidity the capacity for the same atmoshphere to trap heat is much higher ... that vapor wasn't there before we started converting liquid H20 to it's vapor form due to hydrogen ..

It's a hypothetical situation that begs the question Chuck was asking ... which would be worse for global warming?

Yeah you got the reasoning of the question right. I realize that no one looks long term at the full picture.

I see what you guys are saying about water vapor holding in more heat, but I still don't really see how we'd get to that point. And even if it could, big deal, all you'd need is to tap into the car's compressor to cool and condense the exhaust and just let it drip.

That could be a possible solution, I don't know.

It also could be the whole notion is completley off-key .... Nobody really knows yet and we probably won't for 50 years

The fuel cell would be producing the energy for the compressor and it only transfers heat. I don't know enough about the chemistry of the cells.

the AC compressor... surely if it can cool the air in the car surely it can condense the exhaust.

AC is just a heat exchanger, you can cool one area and heat another. It could work I guess, but the total amount of heat is greater after use, just displaced.

yeah, if your car is about to overheat, you are supposed to turn on the heater. That's what I heard anyways.

well duh Chuck geez.

and Jessica that makes zero sense.

when you turn the ac off/heater on heat gets blown out of the engine and into the car - less hot air in the engine -> cooler the air in the engine -> less overheating. you just deal with it by rolling down windows. so you gotta turn it on full blast. temp. solution but it'll get you to a gas station or something

(The heater in most cars works by using extra heat from the engine to heat the incoming air)

they taught that in driver's ed. it makes sense to me

The heater in your car doesn't suck heat from the engine compartment. Your engine coolant runs through the heater core (basically a radiator) and provides hot air. If your engine is overheating it is for a reason. If you're turning on the heater that means you're leaving the damn engine RUNNING, which is the absolute last thing you should if it is overheating.