Denitrifying bacteria and hungry plants do sterling work in disposing of the nitrates that we pump into rivers and streams. But as the excess influx goes up and up, the efficiency of removal goes down and down.
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Seitzinger, S. Out of reach. Nature 452, 162–163 (2008). https://doi.org/10.1038/452162a
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DOI: https://doi.org/10.1038/452162a