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Why when carbon emissions are talked about they always refer to CO2 and everyone uses the same pictures.... city drowned in SMOG.
Smog is hydrocarbons not CO2, we're talking about the physical dirt" that is ejected out of the exhaust pipe of an engine. CO2 is a good thing, the tree's and other plant life love it. Get rid of the smog, aka: hydrocarbons and there will be enough light for the plants to process the CO2 via photosynthesis.