A framework for nitrogen futures in the shared socioeconomic pathways

David R. Kanter, Wilfried Winiwarter, Benjamin L. Bodirsky, Lex Bouwman, Elizabeth Boyer, Simon Buckle, Jana E. Compton, Tommy Dalgaard, Wim de Vries, David Leclère, Adrian Leip, Christoph Müller, Alexander Popp, Nandula Raghuram, Shilpa Rao, Mark A. Sutton, Hanqin Tian, Henk Westhoek, Xin Zhang, Monika Zurek