hydrogen-a new fuel alternative?

It is common knowledge that we will soon run out of fossil fuels. One experimental alternative to fossil fuels is hydrogen. Hydrogen produces at least twice as much heat energy per gram than any other common fuel. Hydrogen burns cleanly with oxygen to produce a very safe water, in the form of steam. Currently hydrogen is used to fuel rockets, where it is used to bring the rocket into orbit and to provide electricity in the shuttle. There are already experimental hydrogen-fueled cars being used.