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Using "carbon" for carbon dioxide and methane is just a way for the nitwits politicians and journalists to feign knowledge when most haven't taken a serious science class since 10th grade. I noticed the same phenomena last year in Cincinnati when the media within a week of each other stopped refering to our airport as "the airport" or "the Greater Cincinnati, Northern Kentucky International Airport" (ugh), substituting CVG. e.g. "it's 70 °F downtown, 72 °F at CVG".
BTW, whatever happened to the words "earth" or "world". Now everything is "The Planet". As in the most important concert on The Planet, or we must save The Planet... argh!!!
This is what we get for letting two "C" students (Bush & Gore) control the debate on the most important scientific issue today. Marketing fluff is as important as actual data in shaping policy and decisions.