Even the most incurable optimists among the globe’s spin doctors will find it difficult to dress up the Rio+20 summit of the UN Conference on Sustainable Development as a halfway modest success. Indeed, it represents a failure of epic proportions, which pro­ves that the world’s leaders have learned virtually nothing during the 20 years that have passed since the landmark 1992 earth summit, which negotiated path-breaking conventions on climate change and biodiversity and made commitments to poverty eradication and social justice.

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