Except for certain regions of the world, I don't think salt water will be needed.  An acre-inch of water is equal to 28,359 gallons of water.  Where I live we get 250 inces of snow (25 inches water equivalent) per year plus rain.  Lets say 30 inches of rain equivalent per year.  So, that's 850,770 gallons of water per acre.  I own 60 acres, so I'm entitled to process up to 51 million gallons of water per year into hydrogen.  The problem, of course, is that most of the water runs off.  And, since the water is returned back to the environment when the hydrogen is burned, it becomes a closed cycle.  The hydrogen used in California, for instance, may fall as snow in the mountains and be used again by Californians.
GeoM
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