For those familiar with the work of Stanford Biologist Peter Vitousek, this paper is related to his study of human consumption of the products of photosynthesis.
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Humanity’s impact on the biosphere’s structures (e.g., land cover) and functioning (e.g., biogeochemical cycles) is considerable. It exceeds natural variability in many cases. Sanderson and others have classified up to 83% of the global terrestrial biosphere as being under direct human influence, based on geographic proxies such as human population density, settlements, roads, agriculture and the like; another study, by Hannah et al., estimates that about 36% of the Earth’s bioproductive surface is “entirely dominated by man”.
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