<P> In 2012 , the United Nations Conference on Sustainable Development was also held in Rio , and is also commonly called Rio + 20 or Rio Earth Summit 2012 . It was held from 13 to 22 June . </P>
<P> In 2012 , the United Nations Conference on Sustainable Development was also held in Rio , and is also commonly called Rio + 20 or Rio Earth Summit 2012 . It was held from 13 to 22 June . </P>
when was the rio +20 summit in rio de janeiro held
when was the rio +20 summit in rio de janeiro held
2012
2012