Natural gas Natural gas Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium. It is formed when layers of decomposing plant and animal matter are exposed to intense heat and pressure under the surface of the Earth over millions of years. The energy that the plants originally obtained from the sun is stored in the form of chemical bonds in the gas. Natural gas is a fossil fuel used as a source of energy for heating,
Gas Natural Building out from the main tower. It is located near the seafront, and to the southwest of two other La Barceloneta skyscrapers, the Hotel Arts and the Torre Mapfre. Gas Natural Building Gas Natural Building, also known as Mare Nostrum Tower, is an office skyscraper located in the La Barceloneta neighbourhood of the Ciutat Vella district in Barcelona, Spain. It is the headquarters building of the Spanish company Naturgy, formerly known as "Gas Natural". The Gas Natural Building was designed by the architects Enric Miralles and Benedetta Tagliabue in the high-tech architectural style. It was completed in 2005, and officially inaugurated