Guardian: As world leaders prepare for the Rio+20 meeting in just over a week, now is a fitting moment to assess the true legacy of the original Earth Summit in 1992.
In many respects, the summit was a watershed moment for the environment. It brought together a remarkable 172 countries, more than 100 of which were represented by their leaders, to start to address at the global level the unsustainable use of natural resources and man’s impact on the environment.
Yet, two decades on, all the major scientific…

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