Too much for some, too little for others

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Environment In developed nations and emerging economies, excess nitrogen from agriculture and fossil fuel combustion is having negative effects on biological diversity, climate, and human health. But in other parts of the world, nitrogen-poor soils threaten food security. In a Perspective, Stevens discusses the effects of these major perturbations to the nitrogen cycle on plants and ecosystems and stresses the urgent need to address the problems of both excess and lack of nitrogen through locally appropriate nitrogen management approaches. Science , this issue p. [578][1] [1]: /lookup/doi/10.1126/science.aav8215