Hydrogen from Water and Carbon?

If we could easily produce Hydrogen, one of the many stumbling blocks to producing a cheap, mass produced hydrogen cell would be removed. We would have all the fuel we need.   The reaction below seems to give us all the Hydrogen we could possibly need. Why is it therefore not used? (and it is not because of the CO2!) H2O(g) + C(s) → H2(g) + CO(g) We can answer the question using Gibbs Free Energy: H2O(g) C(s) H2(g) CO(g)  ΔHfo/ kJ mol-1  -241.8  0  0  -110.5  So/ JK-1 mol-1  188.7  5.7  130.6  197.6 See if you can calculate ΔG for the ...