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Rio+20, an environmental summit whose outcome made all unhappy Washington Post RIO DE JANEIRO — It was hard to find a happy soul at the end of the Rio+20 environmental summit. Not the legion of bleary-eyed government negotiators from 193 nations who met in a failed attempt to find a breakthrough at the United Nations conference ... Rio+20, the unhappy environmental summitThe Associated Press Activists slam Rio+20 sustainable development summit as a 'hoax'CNN UN sustainability summit ends with $513 billion in pledgesLos Angeles Times Economic Times -Boston.com all 2,602 news articles »