Natural Gas
Natural gas is often also referred to as Earth's gas or marsh gas , is a gaseous fossil fuel consisting primarily of methane CH4 ) .
He can be found in oil fields , gas fields and the Earth also coal mines. When the gas is rich in methane produced by anaerobic bacterial decomposition of organic materials other than fossil , then it is called biogas . Sources of biogas can be found in marshes , rubbish dumps , as well as human and animal waste storage .
The main component in natural gas is methane ( CH4 ) , which is the shortest chain hydrocarbon molecules and lightest. Natural gas also contains molecules heavier hydrocarbons such as ethane ( C2H6 ) , propane ( C3H8 ) and butane ( C4H10 ) , as well as gases containing sulfur ( sulfur ) . Natural gas is also a major source of helium gas source .
Methane is a greenhouse gas that can create global warming when released into the atmosphere , and is generally regarded as a pollutant rather than a useful energy source . Even so , the methane in the atmosphere reacts with ozone , producing carbon dioxide and water , so that the greenhouse effect of methane released into the air is relatively only lasted a moment . Source of methane derived from living things mostly from termites , livestock ( mammals ) and agriculture ( estimated emission levels around 15 , 75 and 100 million tonnes per year respectively ) .
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