I believe that 1.2 trillion barrels of oil (shale) are out in Wyoming/Colorado/Utah. As long as a barrel of oil stays above $50, it's economically feasible to extract.
Anybody know more about this than me?
A messy, dirty and expensive process.
Canada has developed technology that has lowered the costs and pollution but I think the EPA could bankrupt these companys if they tried operating in the USA.