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Rockstrom J, Schellnhuber HJ, Nykvist B, de Wit CA, Hughes T, van der Leeuw S, Rodhe H, Sorlin S, Snyder PK, Costanza R. Planetary Boundaries:  Exploring the Safe Operating Space for Humanity. Ecology and Society. 2009;14:32.\par \par Rockstrom J, Schellnhuber HJ, Nykvist B, de Wit CA, Hughes T, van der Leeuw S, Rodhe H, Sorlin S, Snyder PK, Costanza R. A safe operating space for humanity. Nature. 2009;461:472-475.\par \par }