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Talking only about carbon dioxide doesn't really address the problem. Why does burning oil or wood create atmospheric carbon dioxide? Because of the carbon in the cellulose or the hydrocarbon chain. Why does planting trees remove carbon dioxide? Because they convert it into carbon-containing cellulose in order to grow. Why do we have a carbon dioxide problem now, when we didn't before? Because we've been burning carbon.
I hate buzzwords, too, but this is one instance where they're right.