It's like warnings on cigarettes. It might do a little good.
Now, I'm a smoker. Every day people tell me, "Don't you know that will kill you?". I bet that didn't happen as often before they made it known that cigarettes kill.
People telling me cigarettes will kill me is annoying. (That's a different discussion though.) People more aware of the impact car exhaust has on the environment might do this world some good.
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"The fact is that censorship always defeats its own purpose, for it creates, in the end, the kind of society that is incapable of exercising real discretion..." - Henry Steel Commager
"Punk rock music is great music played by really bad, drunk musicians." -Fat Mike
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