Theres community buses at my campus have a VERY large print along the side that say. “Powered by clean natural gas”. What does that mean. Isnt all gas natural?
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[Natural gas](https://en.wikipedia.org/wiki/Natural_gas) is a technical term for a specific kind of gaseous hydrocarbon used as fuel. It’s almost entirely methane.
They’re using “clean” as an adjective, compared to, say, diesel or gasoline-powered engines, because there are far fewer nasty byproducts from using it as a fuel compared to those, and less CO2 for its energy output.
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