Natural gas is considered a potential bridge fuel to a low carbon economy because it is cleaner burning than its hydrocarbon rivals coal and oil. Natural gas combustion emits about two-thirds less carbon dioxide than coal and one-quarter less than oil when consumed in a typical electric power plant. Additionally, improved methods to extract natural gas from certain shale formations has significantly increased the resource profile of the United States, which has spurred other countries to try to develop shale gas. If the United States and other countries can bring large new volumes of natural gas to market, then natural gas could play a larger role in the world's economy. This book examines key aspects of global natural gas markets, including supply and demand, as well as major U.S. developments.