TY - JOUR T1 - Planetary Boundaries. Exploring the Safe Operating Space for Humanity JF - Ecology and Society Y1 - 2009 A1 - Rockström, Johan A1 - Steffen, Will A1 - Noone, Kevin A1 - Persson, Åsa A1 - Chapin, Stuart F. III A1 - Lambin, Eric A1 - Lenton, Timothy VL - 14 IS - 2 ER -