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- ItemRobust relationship between yields and nitrogen inputs indicates three ways to reduce nitrogen pollution(Bristol : IOP Publishing, 2014) Bodirsky, Benjamin Leon; Müller, ChristophHistoric increases in agricultural production came at the expense of substantial environmental burden through nitrogen pollution. Lassaletta et al (2014 Environ. Res. Lett. 9 105011) examine the historic relationship of crop yields and nitrogen fertilizer inputs globally and find a simple and robust relationship of declining nitrogen use efficiency with increasing nitrogen inputs. This general relationship helps to understand the dilemma between increased agricultural production and nitrogen pollution and allows identifying pathways towards more sustainable agricultural production and necessary associated policies.