<P> The United Nations Conference on Environment and Development ( UNCED ) , also known as the Rio de Janeiro Earth Summit , the Rio Summit , the Rio Conference , and the Earth Summit ( Portuguese : ECO92 ) , was a major United Nations conference held in Rio de Janeiro from 3 to 14 June 1992 . </P>
what is united nations conference on environment and development
a major United Nations conference held in Rio de Janeiro from 3 to 14 June 1992