In 1992, world leaders signed up to something called sustainability". Few of them were clear about what it meant. Perhaps as a result, it did not take long for this concept to mutate into something subtly different: "sustainable development". Then it made a short jump to another term: "sustainable growth". And now, in the 2012 Rio+20 text that world leaders are about to adopt, it has subtly mutated once more: into "sustained growth". This term crops up 16 times in the document, where it is used interchangeably with sustainability and sustainable development. But if sustainability means anything, it is surely the opposite of sustained growth. Sustained growth on a finite planet is the essence of unsustainability. As a result, the draft document, which seems set to become the final document, takes us precisely nowhere: 190 governments have spent 20 years bracing themselves to "acknowledge", "recognise" and express "deep concern" about the world's environmental crises, but not to do anything about them. The draft and probably final declaration is 283 paragraphs of fluff. It suggests that the 190 governments due to approve it have, in effect, given up on multilateralism, given up on the world and given up on us. So what do we do now?

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