Natural gas is (for now) the most common and cheapest source of pure hydrogen. The hydrogen is usually extracted using steam.
This is the problem with fuel cell cars - we'll still need natural gas to get the hydrogen fuel - so we're still using fossil fuels. Luckily, the US has a hefty supply of natural gas, and the biggest supplier - Russia - is currently on friendly terms with us.
The next breakthrough to really put us on the path to fuel cell vehicles will be when engineers can come up with a cheap (i.e. - solar powered) method of using electrolysis to separate hydrogen from water molecules.
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If you want to avoid 95% of internet spelling errors:
"If your ridiculous pants are too loose, you're definitely going to lose them. Tell your two loser friends over there that they're going to lose theirs, too."
It won't hurt your fashion sense, either.
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