FIGURE 14.1 Global population trends from 1860 to 2000 (billions, left axis) and reactive nitrogen (Nr) creation (teragrams nitrogen (Tg N) per year, right axis). "Haber-Bosch" represents Nr creation through the Haber-Bosch process, including production of ammonia for nonfertilizer purposes. "C-BNF" (cultivation-induced biological nitrogen fixation) represents Nr creation from cultivation of legumes, rice, and sugarcane. "Fossil fuel" represents Nr created from fossil fuel combustion. "Total Nr" represents the sum created by these three processes. Reproduced from Galloway et al. (2003); copyright American Institute of Biological Sciences.

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