One type of fossil fuel energy source is natural gas. Numerous distinct chemicals can be found in natural gas. Methane, a molecule consisting of one carbon atom and four hydrogen atoms, makes up the majority of natural gas. Natural gas also includes trace amounts of nonhydrocarbon gases including carbon dioxide and water vapor, as well as natural gas liquids (NGLs), which are hydrocarbon gas liquids. Natural gas is used by humans to create materials and chemicals as well as fuel.