Rio+20 summit criticised as 'disappointing'

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The UN conference on sustainable development is coming to a close in Rio, Brazil, amid widespread criticism that little has been achieved.

Twenty years after the iconic Earth Summit in the same city, the meeting was meant to chart a new path for sustainable development to raise people out of poverty and protect the natural world.

But it has been branded insipid, disappointing, and a failure of leadership, as David Shukman reports from Rio.

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