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Sure, lets all ban a mod to a car that every one of us strives to have tuned to the max on efficiency in the engine and not be overly wasteful or otherwise risk our own engine's life... But, we'll let total clunkers drive about spewing forth all manner of exhaust funk in to the air, getting horrible gas mileage and being just a total POS.
There are plenty of lifeforms on this planet that live off of CO2 and other emissions..
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