| http://www.w3.org/ns/prov#value | - The difference between traditional pollutants and CO2 is that the latter is a product of even ideal, perfectly-clean combustion whereas the former are usual the result of the combustion not being fully efficient (or are a result of other substances found in the fuel) and thus occur in smaller quantities and are easier to reduce either by improving the combustion process or cleaning the pollutants
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