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Personally, I think the sooner we get rid of the internal combustion engine, the better. (with the exception of some race cars)
Remember, when ANY Hydrocarbon burns you will get Carbon Dioxide regardless of how efficiently it is burned. And if it is not done 100%, and it almost never is, you also get poisonous Carbon Monoxide, and plain carbon.
CO2=greenhouse gas=globalwarming
That is why we should stop burning things!
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