A safe operating space for humanity

By Johan Rockström, Will Steffen, K. Noone, Å. Persson, F. Chapin, Eric F. Lambin, T. Lenton, Marten Scheffer, Carl Folke, H. Schellnhuber and 19 more. Nature, 2009

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Impacts of Nitrogen and Phosphorus: From Genomes to Natural Ecosystems and Agriculture (2017, background): “They argued that some of these have already been surpassed, including a proposed boundary of 35 million tonnes (Tg) per year of N2 removed from the atmosphere, far below the actual annual rate of 121 Tg (Rockström et al., 2009b).”
A Vision for Human Well-Being: Transition to Social Sustainability (2012, neutral): “Similarly, the present policy of encouraging consumption to bolster economic growth results in increasing demand for natural resources, which in turn imposes more pressure on planetary boundaries [2].”
Rigorous classification and carbon accounting principles for low and Zero Carbon Cities (2011, background): “If humanity is to meet the constraints imposed by the planetary boundaries (Rockstrom et al., 2009), which for CO2 atmospheric concentrations means stabilization at 350 parts per million, then drastic cuts in emissions on the order of 95% from all sources will be necessary in the developed world2…”
Agricultural insecticides threaten surface waters at the global scale (2015, background): “] pollutants in the global environment” (25), made with regard to pollution as one of the two planetary boundaries that have not yet been quantified.”