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Natural gas, which is largely methane, releases less carbon dioxide when burnt than the other fossil fuels, coal and oil. So it is the least polluting of the fossil fuels.

However, natural gas, or methane, is released into the atmosphere by belching cattle, anaerobic decomposition in landfills, and melting tundra and lake beds. It is a greenhouse gas 21 times more dangerous than carbon dioxide, so when it escapes into the atmosphere, it is very polluting.

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Q: Why is natural gas least polluting?
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