Hydrogen is already a major commodity in the U.S. economy and production could readily be expanded to serve new markets. More than 50 million metric tons are produced annually worldwide (11 million metric tons in the United States), principally from SMR (steam methane reforming) of natural gas. Much of this hydrogen is used in petroleum refineries, in the production of ammonia for fertilizers and other chemicals, and in food processing. Current hydrogen output is sufficient to provide fuel for 250 million fuel cell vehicles worldwide (55 million in the United States). Given the emergence of la...

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