With humans having an increasing impact on the planet, the interactions between the nitrogen cycle, the carbon cycle and climate are expected to become an increasingly important determinant of the Earth system.
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Acknowledgements
This work was supported by funds from ETH Zurich. We thank J. Flückiger for helping us with the ice-core records.
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Correspondence should be addressed to N.G. ([email protected]).
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Gruber, N., Galloway, J. An Earth-system perspective of the global nitrogen cycle. Nature 451, 293–296 (2008). https://doi.org/10.1038/nature06592
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DOI: https://doi.org/10.1038/nature06592
