United States has vast amounts of unused geothermal energy

VAST resources to produce hydrogen

It's estimated that one tenth of one percent of the heat produced in the earth's crust would provide enough energy to meat global requirements for 13,500 years. The United States also has vast amounts of geothermal energy particularly in the west which, if it could be harnessed, would provide a means of generating large amounts of electricity without greenhouse gases or hazardous wastes like nuclear power.    Geothermal wells can be used to power electrical generators, which in turn are used to produce hydrogen from water.  Hydrogen could be  stored and used to power fuel cell vehicles.  Original geothermal  info from autobloggreen.com