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 (or just “gas” in the US) is gas that is extracted out of the ground and then minimally processed by cleaning / separating / etc. Natural gas is mostly methane (CH4).
This distinguishes it from other fuel gas, like liquified petroleum (LP gas, or “propane”) which is a byproduct of the oil refining process. LP gas is made up of methane, butane, propane, ethane.
Natural gas being called “clean” is just marketing by the natural gas industry. Yes, it is cleaner than coal or fuel oil or diesel – as in natural gas produces less soot and particulate matter, because it is easier to set up to produce complete combustion. But burning natural gas still produces CO2, which is a primary greenhouse gas….so bad for the environment, but not visible as such.
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