<P> The United Nations Conference on Sustainable Development ( UNCSD ) , also known as Rio 2012 , Rio + 20 ( Portuguese pronunciation : ( ˈʁi. u ˈmajʒ ˈvĩtʃi ) ) , or Earth Summit 2012 was the third international conference on sustainable development aimed at reconciling the economic and environmental goals of the global community . Hosted by Brazil in Rio de Janeiro from 13 to 22 June 2012 , Rio + 20 was a 20 - year follow - up to the 1992 Earth Summit / United Nations Conference on Environment and Development ( UNCED ) held in the same city , and the 10th anniversary of the 2002 World Summit on Sustainable Development ( WSSD ) in Johannesburg . </P>
when was the r10 +20 summit in rio de janeiro held
13 to 22 June 2012