The United Nations Conference on Sustainable Development, Rio +20, will be held from 13 to 22 June 2012, in Rio de Janeiro, Brazil. It is known as Rio +20 because it marks the twentieth anniversary of the United Nations Conference on Environment and Development (Rio-92), and should help define the sustainable development agenda for the coming decades.

Brazil's petition to host Rio +20 was approved in the 6th Session of the General Assembly of the United Nations, in 2009. The objective of the...
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