In compressed natural gas (CNG), methane makes a very good fuel for cars. It has an efficiency not far below gasoline, has lower emissions, and is cheap. It is not a solution to our problems, however, since natural gas is a fossil fuel and, although the quantities are lower, it does still emit greenhouse gases. It also requires a much larger tank than gasoline to afford the car a comparable range, sacrificing, for example, the trunk space for a CNG tank. Methane can also be extracted from organic waste to create biogas.
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