AdvertisementRio+20 Summit Sustains Little More Than SentimentJune 23, 2012Richard HarrisfacebookEmailU.N. General Assembly President Nassir Abdulaziz Al-Nasser, United Nations Secretary General Ban Ki-Moon, Brazilian President Dilma Rousseff, Brazil's Secretary of the Conference Luis Figueiredo Machado and Rio+20 Secretary General Sha Zukang attend the closing ceremony of the Conference on Sustainable Development in Rio de Janeiro on Friday. (AP)