Breathe in. Hold it. Hold it. O.K., now breathe out.
Unless you're outdoors in the midst of a cold snap, chances are you can't see your breath. And no one would ever ask you to drop a quarter in a tin box for the right to free this invisible spirit from your lungs. Yet last November, Murphy Oil Corp., based in El Dorado, Ark., voluntarily shelled out several hundred thousand dollars for the right to cough out carbon dioxide, the same stuff you exhaled three sentences ago.
The reason it did so is closely related to events that occurred that...
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