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” in this context means (mostly) methane. Back in the day, “natural” distinguished it from [coal gas](https://en.wikipedia.org/wiki/Coal_gas). And “clean” is there as a more recent marketing term to remind you that burning methane produces fewer emissions than something like diesel.
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