Well, we take that back, the revolutionary Ford P2000 HFC does emit water vapor. The Ford P2000, a result of the company's fuel cell program, is a real car, big enough for a family of five. It weighs only 3,200 pounds. It goes from 0-60 in less than 14 seconds. All in all, it's a viable vehicle, something people will want to drive.
Fuel cells are devices that generate electrical energy by combining hydrogen and oxygen.
The hydrogen, which can be stored on-board as a liquid or a gas, is combined with oxygen from the air to produce electricity. There is no combustion. The only emission from the P2000 is water. We could go on-but it gets a bit technical. In other words, fuel cells not only hold promise as a replacement for the impractical batteries that operate electric vehicles today, they could replace the internal combustion engine.