Pop Quiz: Gassy Guests
Answer: D. "Atmospheric residence time represents the average amount of time the molecules of a greenhouse gas exist in air before it is somehow removed. The average residence time of the greenhouse gases carbon dioxide and nitrous oxide is more than a century. Consequentially, these greenhouse gases will impact global warming long after emission cut-backs are achieved. Contrastingly, methane (a much more powerful greenhouse gas) only has a residence time of one decade."
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