No, the leftists specifically mention carbon dioxide when talking about gasoline automobiles. While, yes, cars emit both carbon monoxide and carbon dioxide, they have never mentioned this in any of their campaigns against cars. I do agree though, carbon monoxide is dangerous and of course it's not good to pump too much of it into the air, but again, leftists never talk about reducing carbon monoxide, mainly because the levels that are emitted into the atmosphere are negligible.