Is the world running out of fossil fuels? Perhaps not for many years to come now because of shale gas. Global gas resources have doubled with the advent of abundant gas from shales. Shale gas is a proven economic and industry game-changing fossil fuel in the USA with cheap gas and LNG exports the result. Advanced technologies, such as modern hydraulic fracturing and sophisticated horizontal well emplacement, are required to unlock the gas potential from the low permeability shale reservoirs. Much has been learned from successful development of USA shale gas and such 'unconventional' gas resources could soon be a game-changer in other parts of the world.