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THE United Nations Conference on Sustainable Development (Rio+20) was held in Rio de Janeiro,Brazil on June 20-22.This crucial meeting on intational sustainable development came after the United Nations Conference on Environment and Development in Rio de Janeiro in 1992 and the World Summit on Sustainable Development held in Johannesburg in 2002.This time,people focused their attentions on whether the world could reach a consensus and take pragmatic actions on issues such as the global sustainable development,environmental protection and poverty alleviation programs.