Having been reserved for decades primarily for the more noble uses of industry, natural gas, which basically has no captive market, is now the energy of choice in a multitude of applications. Although gas resources are limited in the very long term, they are yet sufficiently abundant to make a major contribution to the energy industry of the 21st century. Endowed with intrinsic qualities that make it less pollutant than its competitors, natural gas is the commercial energy harboring the strongest growth potential in the future energy balance.