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...by someone who only wants to argue about the semantics of words. If we are discussing global warming, and some cad interjects "It's Carbon-Dioxide, not Carbon", the comment has no bearing on the issue we are discussing. Suddenly, everyone veers off into a discussion of the Carbon Cycle and why Carbon is the proper term. In casual conversation, it only matters if there is some possible confusion over the overall topic of conversation. That's my pet peeve... along with the use of "exact same".