U.N. chief Ban Ki-moon has called for a show of “political courage” to seize the “once-in-a-generation” opportunity presented by Rio+20. Credit: UN Photo/JC McIlwaine

U.N. chief Ban Ki-moon has called for a show of "political courage" to seize the "once-in-a-generation" opportunity presented by Rio+20. Credit: UN Photo/JC McIlwaine

 
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