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Just take a moment to think about a tank of hydrogen gas in your car. It is highly explosive. If you get into a wreck, and the tank busts, just a spark could kill many people. Plus, 99% of the hydrogen on this planet is trapped in water molecules. It takes a lot more energy to take apart those molecules than what the hydrogen will give us back, making it inefficient. Even if we were able to get cheap hydrogen gas, fuel cell technology is extremely expensive so it wouldn't be too economical right now.
I am no expert on CNG but from what I hear, it is not a good short-term solution.
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