Before I get started, let me first make sure we all understand that hydrogen power is not an actual source of energy but rather an energy storage device. This is because we get hydrogen from molecules and the extraction requires energy. The two primary sources for hydrogen are natural gas and water. It requires extremely high amounts of energy to extract hydrogen from water (electrolysis). Where do you think this electricity comes from? According to the DOE, 70.6% came from fossil fuels and another 20.0% came from nuclear energy, both sources being horrible polluters.
That being said, I am certain you can understand that hydrogen fuel cells do not eliminate the smog, but just creates it at the power factories rather than the vehicle itself. Also, automobiles contribute roughly a fifth of the total pollution while half of the pollution comes from industrial applications. So in addition to keeping the same amount of smog, we'll throw in enough water vapor to cause low level clouds. With wator having an extremely high specific heat, roughly 9 times that of iron, it is sure to have drastic effects environmentally.
With respect to the global warming issue, not only do the sources of hydrogen produce more heat than we'd need if we used those sources directly for energy, but we'll have other heat issues along the way. That includes heat being made from the machines that compress the hydrogen.
Keep the arguments for hydrogen coming, I like showing why hydrogen fuel is evil.
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