Natural gas is a gas that consists primarily of methane and is widely used as an energy source around the world. The natural resource is important for the creation of fertilizers, and is now used to power a wide variety of applications including automobiles. Supplies of natural gas are concentrated in a few regions of the world, and the fuel has historically been the source of political disputes in Eastern Europe and the Middle East as well as in the U.S. The place of natural gas in the domestic energy equation has been widely discussed in recent years, with many advocating for increased adoption as an alternative to crude oil products [see also The Guide To The Biggest Companies In Every Major Commodity Sector].