Natural gas comprised 22 percent of U.S. energy use in 2010 and is most commonly used to produce heat or electricity for buildings or industrial processes. Less than two percent of U.S. natural gas is used as a transportation fuel, typically for bus fleets. Natural gas is also used to produce fertilizer, paints, and plastics. The United States produces around 19.5 percent of the world’s natural gas and consumes about 21.4 percent. Natural gas is most commonly transported by pipeline, which makes Canada the key exporter to the United States, while Russia remains the main supplier for much of Europe. Increasingly, however, natural gas is being transported by ship in a liquefied form (LNG) to meet greater global demand for the fuel.