An environmental advantage to burning ethanol is that when it is grown, it uses CO2 from the atmosphere. Also, ethanol has a lot fewer toxic emissions. It emits fewer greenhouse gases. There are many downfalls as well including lower MPG and higher food prices as a result of using ethanol.
Ethanol burns more cleanly because oxygen is a larger component of its makeup. Therefore, when it is added to gasoline, the CO2 impact to the atmosphere is not as great as if pure gasoline were burned. Carbon monoxide and nitrous oxides are not added to the environment in their unnatural form when ethanol is burned instead of gasoline.
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