If anything this understates the true lead America has

Because the US utterly dominates extraction technology (well in conjunction with Canada) and also has (again, along with Canada) most mineral resources in private hands, resulting in the potential for immense entreprenurial activity in the energy sectors.  Except that our Federal government is by far the most insane major government when it comes to utilizing these resources.

In 2009 the CRS upped its 2006 estimate of America’s enormous natural gas deposits by 25 percent to around 2,047 trillion cubic feet, a conservative figure given the expanding shale gas revolution. At current rates of use that’s enough for around 100 years. Then there is still the, as yet largely publicly untold, story of methane hydrates to consider, a resource which the CRS reports alludes to as “immense…possibly exceeding the combined energy content of all other known fossil fuels.” According to the Inhofe’s EPW, “For perspective, if just 3 percent of this resource can be commercialized … at current rates of consumption, that level of supply would be enough to provide America’s natural gas for more than 400 years.”

Hint:  it's not Republicans obstructing....