Too much of a good thing.
Sutton, Mark A.; Oenema, Oene; Erisman, Jan Willem; Leip, Adrian; van Grinsven, Hans; Winiwarter, Wilfried
[Editorial] Nature. 472(7342):159-161, April 14, 2011.

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: Curbing nitrogen emissions is a central environmental challenge for the twenty-first century, argue Mark Sutton and his colleagues.

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