the global agroecosystem. (Based on the graph in ref. 7.) flows affected or dominated by human actions flows mediated or dominated by bacteria other flows lion when adding the food derived from grazing and fisheries. And if we were to provide the recent average per capita food supply with the yields prevailing in the year 1900 we could feed only about 2400 million people, or just 40 % of today’s total. We can thus conclude that the Haber-Bosch synthesis now provides the very means of survival for about 40 % of humanity; that only half of today’s population could be supplied by pre-fertilizer farming with overwhelmingl
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