RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Methane molecules, computer artwork. Methane molecules are made up of a single carbon atom (black) and four hydrogen atoms (green). Methane is a gas at room temperature and pressure, and the main component of natural gas. It is a clean and cheap fuel, and if pure, can be liquefied for transport and storage.
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