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Recovery as nitrogen declines

Pollution from atmospheric nitrogen deposition is a major threat to biodiversity. The 160-year-old Park Grass experiment has uniquely documented this threat and demonstrated how nitrogen reductions lead to recovery. See Letter p.401

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Figure 1: The Park Grass experiment.

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Correspondence to David Tilman or Forest Isbell.

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Tilman, D., Isbell, F. Recovery as nitrogen declines. Nature 528, 336–337 (2015).

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