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Disruption of the global nitrogen cycle: A grand challenge for the twenty-first century

This article belongs to Ambio’s 50th Anniversary Collection. Theme: Eutrophication

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Abstract

Disruption of the global nitrogen cycle by humans results primarily from activities associated with food and energy production. Since the middle of the twentieth century, human activities have more than doubled inputs of nitrogen to the Earth’s ecosystems. This new nitrogen is in chemically and biologically active forms (reactive N) and moves through the environment causing an array of health and environmental problems. Research published in Ambio for the past three decades has been documenting this major global-scale problem and has catalyzed the formation of a science-led initiative, the International Nitrogen Initiative (INI), which has informed policies to manage the global nitrogen cycle. Currently, gaps and opportunities in nitrogen pollution policies still exist and require new interdisciplinary science to help to place the nitrogen management challenge in the context of the other environmental grand challenges of our time including climate change and biodiversity loss because their solutions will be interconnected.

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Acknowledgements

I acknowledge support from The Ecosystems Center of the Marine Biological Laboratory in Woods Hole, Massachusetts, my academic home for more than four decades.

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Correspondence to Jerry M. Melillo.

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Melillo, J.M. Disruption of the global nitrogen cycle: A grand challenge for the twenty-first century. Ambio 50, 759–763 (2021). https://doi.org/10.1007/s13280-020-01429-2

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