In the September 2009 edition of Nature, Rockstöm and colleagues proposed a range of essential Earth-system processes and their biophysical thresholds, or ‘planetary boundaries’, that, if exceeded, could lead to catastrophic environmental changes. Earlier this year, the planetary boundaries concept was accepted into the ‘Zero Draft’ of the Rio+20 conference as an essential element in negotiations toward setting environmentally related goals. However, following heavy scientific criticism, the concept was excluded from the Summit’s final statement in June.

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