TheGreatCoolEnergy said:
Well, we could use electric cars. Or hydrocell batteries. Or they could be solar powered.
I guess my point is that gas powered cars are stupid.
Sort of. There is a whole lot more stored energy in gas there there is in batteries, lb for lb that is. Even with the much lower efficiency of a gas engine vs a electric motor (looking at 20% of the energy released through combustion being converted to usable energy vs the 90% efficiency of an electric motor).
Basically saying you can get a lot further on a tank of gas then 400lbs of batteries. In other words at current densities, batteries are only good for people that live inside a city and plan regular trips of no more then forty miles. Yes, forty miles. There are some battery types in the works, and some super capacitor systems that just might get the travel distance up to 300 or so miles, but that may not even be the near future. Super capacitors in general show promise as it is possible you will be able to rapidly charge those systems in as little as five minutes. With the need to conditions and cycle other battery systems you pretty much limited to charging at home, as charging anywhere else (with the exception of work, or a motel, or somewhere you are going to stay for a long time) is impractical.
Besides here in another couple of years we are going to start seeing the one effects of electric cars nobody ever seems to consider as millions of Prius owners start dumping there battery packs, and/or cars for new ones. With current technology the only pollutants coming out of the tail pipe of a properly maintained vehicle are CO2 and H2O. It's not as bad as it looks. Especially when you really start digging into the alternatives.
Hydrogen is not seeing significant use because of infrastructure problems, but I am not sure you are not trying to bring up something along the lines of a wonder-pill or a magic carburetor with your mention of hydrocell. That tends to be what the magic box vendors call their "hydrogen on demand systems". Supposedly they have some form of magic technology that allows them to efficiently use electrolysis to split water into hydrogen and oxygen then burn them and get more energy out of the reaction. This is just a modern day perpetual motion machine. Then again you could be talking about an fuel cell. Those have even more problems namely cost, and all the problems associated with hydrogen rolled into one, since they require pure hydrogen to function. Solar could work if you only want to travel 4 miles per hour on something that weighs as much as a moped and has a roof the side of a mini van.
All in all gas is still here for a reason. The Holy grail right now is a clean, efficient, zero or neutral emission system. If it existed we would be using it.