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Top: A. R. Ravishankara, John S. Daniel, Robert W. Portmann, Nitrous oxide (N20): The Dominant Ozone-Depleting Substance Emitted in the 21st Century, Science, August 2009. Bottom: Eric A. Davidson, The contribution of manure and fertilizer nitrogen to atmospheric nitrous oxide since 1860, Nature Geoscience, August 2009.