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Originally Posted by Cervantes
But as it is now blahblah454 said it best. Why bother why we want to clean up the air, it's a good thing no matter what reason.
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Because of how it would define pollution. CO2 being 'pollution' causes a lot of issues if you want to clean up the air. Based on global warming, we would be BETTER off having engines that produced more particulate matter and less CO2, in other words, better off having engines that burn uncleanly.